TEMO 30 pieces Medium Diamond coated burrs glass drill bit GRIT 120<div style="text-align: left;"><strong>[Product Information]</strong><br><ul><li>New one box set of 30 pieces diamond coated burrs with pointed heads in box set.</li><li>They will fit your hand drill， drill press &amp; your Dremel and Foredom tool with a 1/8" collet. Shank diameter : 3.17mm (1/8 inch)</li><li>included 1/16" diamond drill bits in a medium grit， for drilling glass， shells， tile and stone.</li><li>Overall length is 40mm to 50mm (1 5/8 inch to 2 inch)</li><li>New one box set of 30 pieces diamond coated burrs / pointed heads in box set. They will fit your hand drill， drill press &amp; your Dremel and Foredom tool with a 1/8" collet. Included 1/16" diamond drill bits in a medium grit， for drilling glass， shells， tile and stone. Overall length is 40mm to 50mm (1 5/8 inch to 2 inch). Shank diameter : 3.17mm (1/8 inch). Premium type diamond coated in GRIT 120 (medium). Suitable for glass， marble， rock or jewelry.</li></ul></div><img src="http://ecx.images-amazon.com/images/I/51PXyWM6qUL.jpg" noproxy>