[Material]: #120 Grit Diamond-coated Grinding set, high hardness, uniform sand,rougher which are quicker than the larger grit burrs when sanding, carving and grinding, wear resistance. [Widely Use]: Diamond 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. [6mm shank]: Diamond grinding burr drill bits set fits for most drills, rotary tools or die grinders. High compatibility, easy change. [Great Gift for DIY Enthusiasts]: 10 Different Shapes diamond grinding burr bits, includes sphere, cone, cylinder, round head cylinder, , etc, Rich in quantity and shapes meet your many grinding and carving needs. Colour:As Shown Material:Metal Package Contents: 20 * Diamond Grinding Bits Only the above package content, other products are not included. Note: Light reflection and different displays may cause the color of the item in the picture a little different from the real thing. The measurement allowed error is +/- 1-3cm.