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. 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 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). 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 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., Manufacturer: PokFhgur