Rotary Tools Size: Carbide Burr - 1/8 inch shank (3mm); 1/8 inch cutting dia; 1.5 inch total length. Diamond Burr Bit - 1/8 inch shank (3mm); 1.7 inch total length. What you get: 20pcs carbide burrs + 20pcs diamond bits/1 Set. Material: The tungsten carbide materials give the die grinder bits a smooth processing experience and resistance. Diamond grinding bits are made of diamond particles with high hardness and uniform sand which are also abrasion and impact-. Double Cut and Shapes: 1/8 inch shank carbide burrs with double cut produce a finer than single cut and reduces the size of the chips and slivers. Diamond burr bits are available in 6 shapes to provide different grinding areas, so you can choose the right shape for your material or needs. Widely Usage: Double-cut carbide burr is suitable for fine engraving of wood, cast iron, cast steel, carbon steel, alloy steel, stainless steel, plastic, and other metal and non-metallic materials. 1/8Inch shank diamond burr can be used for precision grinding, sanding, sculpturing, polishing, and dressing in glass, jewelry, ceramic, precious stone, stones, marble, and other materials. Compatible: Carbide burrs 1/8 inch shank fit for electric or pneumatic drives tools, such as die grinders, rock drills, or rotary drills. The diamond burr bit is compatible with for , for , for , and more rotary tools and die grinders. Colour:Silver Material:Metal Package Contents: 1set * tungsten grinder 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.