Engraving bits for tool accessories are made of particle with reliable quality, , wear resistance, high hardness and impact resistance. Radial bristle brushes are made of nylon. 8 colors have different grit: Green-80, Blue-120, Red-220, Brown-320, Gray Blue-400, -600, Light Green-1000, Gray 2500 20 shapes of rotary tool bits . Spherical, pointed cone, cylindrical, oval, T shapes, etc.. 8 different grit of bristle disks can tackle gaps for superior polishing and grinding for your items(Please keep the speed within 2500 rpm (max: 3000 rpm) when using it). When you want to carve or your jewelry, metal, select the bits for tool with the desired shape. Add water to prevent overheating during operation. When using radial bristle disc, select the desired grit, unscrew the screw of the 1/8" shank Carving bits with 1/8" (3mm) universal shank,compatible with , drill,most rotary tools. The grinding burr polishing kit can be used to engrave, grind, drill and cut. Radial bristle brushes disks can be stacked for use(Please do not use in reverse). They are suitable for polishing detailed parts, tiny areas and irregular places. You get 20pcs different shapes compatible with grinding bits, 16pcs radial bristle disc kit(8 different grit, 2pcs of each grit), 3pcs shank with 1/8"(3mm) and 1pc screwdriver for easy installation. Comes with 1pc storage box. This set is the ideal gift for DIY enthusiasts. Grinding Bit Compatible with Polishing Kit, Bits 1" Radial Bristle Disc Kit with 1/8" Shank Burr Bits for Bits for Stone Ceramics Metal Sanding Color: As Shown Material: Metal Package Contents: 40*pcs polishing kit 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.