New a box of 30 pcs diamond coated burrs / pointed heads set. * They will fit your hand drill, drill press & your Dremel® and Foredom® tool with a 1/8" collet. * included 1/16" diamond drill bits in a fine grit, for drilling glass, shells, tile and stone. * Overall length is 40mm to 50mm (1 5/8 inch to 2 inch) * Shank diameter : 3mm (1/8 inch) * premium type diamond coated in GRIT 300 (Fine) * suitable for glass, marble, rock or jewelry. PLEASE ADD WATER FOR COOLANT FOR USING DIAMOND BITS.
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