1. The discs are super-thin making them perfect for making slots and slits and coated on both sides as well as around the edge   2. Diamond burrs Excellent for fine detail work, cutting, engraving, carving, touch-up and finishing,Work on glass, metal , stone, ceramic, wood, plastic   3. Processing of metallic and Non-metallic surfaces using an engraving machine or mini-Drill various forms of cutting part provide efficient processing of materials length is about 40mm,Shank Diameter is 3.17mm   4. Compatible with most of rotary tools (Dremel/ Menards Roto/ Rotozip/ For, Etc) used in hardware, hobby, home, etc   Maximum RPM: 20,000   Name:Engraving Accessories Set   colour:Silver   material:High speed steel + diamond   Package Contents:   6x circular saw blades (22mm, 25mm, 32mm, 35mm, 44mm, 50mm)   30x diamond grinding needle   6x rotary file   1x connecting shaft   2x chuck   Only the above package content, other products are not included.   Note: Light shooting 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.