[6mm shank]: grinding burr drill bits set fits for most drills, rotary tools or die grinders. High compatibility, easy change. [Widely Use]: burr set used for sanding, grinding, sculpturing, dressing in rock, ceramic, glass, precious stone, stones and more, shaping the deadwood areas of bonsai trees, and carving hard stones etc. [Material]: #120 Grit -coated Grinding set, high hardness, uniform sand,rougher which are quicker than the larger grit burrs when sanding, carving and grinding, wear resistance. [Great Gift for DIY Enthusiasts]: 10 Different Shapes grinding burr bits, includes sphere, cone, cylinder, round head cylinder, , etc, Rich in quantity and various shapes meet your many grinding and carving needs., Weight: 0.67902376696 pounds, Manufacturer: Tuidzljd