Features: 100% brand new. Heads shape: sphere, cylinder, bullet, needle, taper. Burr head size: from 6mm to 10mm (0.24"-0.39"). Shank diameter: 6mm (close to 1/4 inch). Grit: 120. Total length: 60mm (2-3/8 inch). Suitable for use in grind the edge of glass, marble, rock, gemstone, jewelry, shells, tile etc.. Use with water as a lubricant will be better. Package List: Diamond coated rotary grinding burrs points X 20 .
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