This set of five sintered diamond coring drill bits are a must for drilling holes in your fused glass creations or for creating perfectly round cabochons. The sintering process ensures durability and long life of the bit. This five piece set contains one each of: 20mm, 25mm, 32mm, 42mm and 48mm bits and will make drilling holes in your glass like slicing through butter! These bits are designed to be used in conjunction with a drill press and are NOT recommended for a hand-held drill or a Dremel.
*For comparison, the relative size of these bits in inches are as follows: 3/4, 1, 1 1/4, 1 5/8, and 1 7/8. For exact conversion, please use this handy calculator.