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Small Diamond Drill Bits


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Quantity Purchased Price
1 - 4 $7.51
5 - 9 $6.62
10 - 24 $5.19
25 + $4.78

Sizes available:  0.75mm, 1.00mm, 1.25mm, 1.50mm, 2.00mm, 2.50mm, 3.00mm

These are our premium, precision-made small diamond drill bits.  These super small diamond cylindrical drill bits are excellent for drilling small holes in some of the hardest materials around. Very popular with jewellery makers, these diamond tip drill bits are used for drilling holes in shells, drilling holes in tough glass, drilling holes in beads, drilling holes in tough sea glass and drilling holes in hard stone, gemstones, concrete, pebbles, precious and semi-precious stone, porcelain, optical material, pearls, composites and rock.

  • Use on slow speeds. We recommend 5,000-10,000 rpm
  • Use little pressure. Let the drill do the work
  • Use plenty of cold water

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Please read on for usage instructions, chuck and collet requirements and further information...

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Small Diamond Drill Bits Versus Small Diamond Core Drills

These small diamond drill bits are solid and, therefore, have a larger surface area than the small diamond core drills, making them more robust.  

Due to a larger diamond coated area than the core drills, they may last longer and drill more holes. They must certainly be used for drilling holes in particularly tough sea glass, gemstone, porcelain and any stone high on the Moh's scale.

Small Diamond core drills will glide through the material a little easier and more quickly, making them the ideal choice for beginners.

When using a diamond cylinder drill bit for glass or diamond drill bits for stone, users often keep a combination of both types in their tool kit in case they come across a tough piece. You may also find a personal preference for using one over the other.  

How to use Diamond Drill Bits:

You will need an adjustable chuck attachment for your drill to hold the small shank sizes of these drill bits. Please look at the technical 'tab' to read the shank size dimensions.

If you have a Dremel we highly recommend using the Dremel 4486 Multi Chuck to hold these small drill bits. All sizes from 0.75mm upwards can be held in this chuck.

Tip: The following three crucial elements when drilling will prevent the diamond grit from wearing off or burning away, prevent the drill bit from snapping (too much pressure applied), prevent your material from cracking,  and extend the life of your drill bits.

  • Use with plenty of cold water (if drilling in a container, change the water if it turns cloudy)
  • Use at a slow speed. Do not exceed 10,000 RPM
  • Use at low pressure. Let the weight of your rotary tool do the work.

To get the best from our diamond tipped drill bits, please ensure you read through the Tutorials section on our blog before attempting to use our drills for the first time. Here, you will find tips and video footage on how to drill glass, how to drill gemstones, how to drill bottles, how to drill pebbles and how to drill sea glass. There are also helpful hints on the correct speeds and pressure to be used.

You might also like to read our article: 12 Things You Should Know about Diamond Drill Bits.

"I am very impressed with the diamond drill bits I am using to drill sea glass, particularly the 2mm size which sometimes lasts up to 100 pieces. Thank you" - Assja Baumgartner. Arran Gems
"The diamond drill bits from Eternal Tools are worth every penny! Cuts through Guatemalan Jade like it was Brazilian Soapstone" ~ Chris Boland Designs

Disclaimer. To the best of our knowledge, using rotary tools near water has never been endorsed by any of the rotary tool manufacturers. If you do choose to drill near water or with attachments under water connected to your drill then you do so at your own risk. Please be aware that mixing electricity and water can be very dangerous.


Diamond grit is precisely electroplated onto a hardened steel shank

Diameter: 0.75mm

  • Overall length: 28mm
  • Diamond tip length: 4.00mm
  • Shank: 0.50mm

Diameter: 1.00mm

  • Overall length: 38mm
  • Diamond tip length: 3.50mm
  • Shank: 0.80mm

Diameter: 1.25mm

  • Overall length: 38mm
  • Diamond tip length: 5.00mm
  • Shank: 0.85mm

Diameter: 1.50mm

  • Overall length: 38mm
  • Diamond tip length: 4.00mm
  • Shank: 1.10mm

Diameter: 2.00mm

  • Overall length: 38mm
  • Diamond tip length: 3.50mm
  • Shank: 1.50mm

Diameter: 2.50mm

  • Overall length: 38mm
  • Diamond tip length: 3.50mm
  • Shank: 2.00mm

Diameter: 3.00mm

  • Overall length: 44mm
  • Diamond tip length: 12mm
  • Shank: 3.00mm

Questions & Answers

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Other questions and our answers

Hi, I need a diamond drill bit for my Dremel 3000 for use on semi-precious stones. Do you have these in stock? Many thanks.

Jean Johnson

Hi Jean, Yes you're on the right page, the Small Diamond drill bits are ideal for drilling through semi-precious stones and other such hard materials.  You will need an adjustable chuck to hold the very tiny shanks of these drill bits into your drill. For your Dremel we recommend the Dremel Multi Chuck.

Hi, I want to order diamond bits to drill 1mm holes in 500um thick borosilicate glass wafer. Could you please tell me if 0.75mm diameter drill bit would be perfect for that or not. Also, what other items I would need to drill hole along with drilling machine. Besides, could you suggest me which drilling machine would be sufficient for this job. Thank you. Best Regards Deepika Sharma

Deepika Sharma

Hi Deepika,

Good to hear from you. We recommend using a Dremel 3000 drill with a Dremel Multi Chuck and use either the small diamond drill bits or the small diamond core drills. If you are new to drilling holes in glass we recommend trying the core drills first. The size of the core drill indicates the size of the hole you will achieve, so if you need a 1mm hole, you will need to purchase the 1mm diamond core drills. All the best with the project.

Will the small diamond drill bits work in a drill press ?


Hello Ann, Yes they work perfectly well in a drill press.  They will work in any drill so long as there is an adjustable chuck to hold the shank of the drill bits. 

Will your drill bits fit my drill?


Our drill bits will fit all rotary drills so long as you have an adjustable collet or chuck with which to hold the shank of our very small drill bits. Sometimes when buying a drill they will come with an adjustable collet but if you find you are in need of one then we supply either a Dremel Multi Chuck (DMC4486) or a Dremel Collet Nut Kit (DCNK4485).

I want to enlarge some very small holes in 4 -6 mm rough uncut diamond beads. I need the holes to be 1mm. to accommodate .8 - 1 mm silver wire. Would the drill bits be suitable for this? Should I use a twisted or core drill bit?


To enlarge holes you need to use the Small Diamond Twist drills. 

These are ideal for increasing the size of holes in beads once the hole has been drilled. 

Hi there ,Can this drill bit 3 mm be used for drill on vitrified /mosaic tiles ? Thanks .... antony


Hi Antony, 

Good to hear from you. 

Yes, the small diamond drill bits can be used on this material.  They are ideal for hard materials so glass, enamel, ceramic, stone, glazed pottery and shell, that sort of thing.  

we wanted to make a 5mm hole. Is that possible? In stones from the beach.

kent francis

Yes, you will need a 5mm diamond core drill.

This blog article will help show you how to drill the holes through the pebbles you have:

What is the diameter of the part that goes in the drill? Will these fit in a standard dremel? If not is there a light weight tool that can be used with them? I'd like to carve some small stones.

Eric Grab

Take a look at the technical tab where there are detailed specifications of each size drill bit and the diameter size of the shank. (the bit that goes in your drill)  You will need the Dremel Multi chuck which attaches to your drill in order to hold the tiny shanks of these drill bits. 

Hi, are the bits for wet or dry use, and is a slower speed preferable to a faster one. Cheers.


These are to be used wet on a slow speed with little pressure  

Will l need to buy a Dremel, or may I use a regular drill?

Dena Roy

You will need a small hobby type rotary tool with an adjustable chuck. (for instance, the Dremel 3000 with a Dremel Multi Chuck)

A regular household drill will be too heavy and cumbersome for the delicate work you will be doing with these tiny drill bits.

Can I use these in my dremel

Chris Levings

Yes, so long as you have the Dremel Multi Chuck

For some examples of how to use these drill bits, you may be interested in a couple of articles we wrote:

How to drill sea glass

How to drill pebbles

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