It's Material: Resin Color: BlackOur resin cutting discs set is by low material loss with sharp knife, in good shape without broken edges. It is , safe and efficient, and can be easily attached to rotary tools. Ideal for cutting all kinds of metal, cutting bolts or bolts, or removing rusty or missing bolts and bolts by making gaps in them. They come with a 2mm mandrel for mounting in compatible hobby tools with the same size chuck. Application: use with rotary tools, for cutting metal/plastic/fiber/wood, etc. Specification of Dials Dia. : 32mmShank Size: 37mm (L) x 2mm (Dia.)Non-retail PackageQuantity: 26 Pieces (1 Set)Note: Due to the difference between different monitors, the picture may not reflect the actual color of the item. Package Included:25Pcs x Cutting Disc1Pc x Mandrel