New one box set of 30 pieces diamond coated burrs with pointed heads in box set.
They will fit your hand drill, drill press & your Dremel and Foredom tool with a 1/8" collet. Shank diameter : 3.17mm (1/8 inch)
included 1/16" (1.59mm) 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)
There are some sphere, cylinder, bullet, or needle sharp. 1/8" (3.175mm) shank and 1 3/8" shank length. TITANIUM coated with PREMIUM grade diamond sand. Grit 120. More durable than the ordinary diamond coated burr. Suitable for use in grind the edge of glass, marble or rock. Come with the case as shown on picture with cover.