Features : 100% Brand New and High Quality It is durable, safe and efficient, can be easily attached to the rotary tools. Ideal for cutting all kinds of metal, cuting bolts or screws or removing rusted or stripped bolts and screws by making slots in them. They come with a 2mm disc for mounting in compatible hobby tools with the same sized chuck. Material: resin Color: black,brown Discs diameter: approx24mm Thickness: approx0.7mm Hole: approx. 2.2mm Size: approx. 24mm x 2.2mm Usage: Use with rotary tools, for cutting metal/plastic/fiber/wood, etc.