Our Small Diamond Core Drills allow good circulation of water and will stay cooler whilst drilling. These are ideal for drilling those tough pieces of Sea Glass. The Small Diamond Drill Bits have a solid end and therefore a wider surface area and can also be used for drilling sea glass. If you're a beginner and have a Dremel Rotary tool then you might like to start off with our Diamond Drill Bits Set for your Dremel Tool. This includes a mixture of small diamond drill bits and core drills and a Dremel Multi Chuck which you will need for holding these small drill bits.