Diamond twist drill bits for drilling, enlarging and refining holes in glass, beads and pearls.

Available in diameters from 0.75mm to 3mm, these small diamond-coated bits are especially useful for bead makers, lampworkers and jewellers who need to widen an existing hole to accommodate thread, cord or jewellery findings.

Diamond grit along the tip and sides provides an abrasive working surface for use on glass, stone, ceramics, porcelain and shell.

Best suited to enlarging existing holes: these diamond twist drill bits can also drill new holes, but are more suitable for widening and refining holes that have already been drilled. If your main task is drilling new holes, browse our diamond drill bits for other options.

Check your tool fitting: each bit has a straight shank with the same diameter as the selected drill size. Your chuck or collet must be able to grip that diameter.