Features:Great addition to your hobby craft tool kitDiamond coating is on both sides of the discIdeal For Cutting: Gem stones， metal， glass， carbide and other hard materialGrain fineness number: Approx. 150Disc Diameter: Approx. 18 mmDisc Thickness: Approx. 0.5mmCenter Hole Diameter: Approx. 3 mmShank Diameter: Approx. 3.1 mmMaterial: Carbon steel18mm cutting discs with diamond coating on both sides. Come with 3.1mm diameter mandrel， these cutting discs will fit most rotary tools. These cutting discs are perfect for all sorts of jobs like model making and the like.Note: Lighting， display and other factors may cause COLOR SHADING， please comprehensive pictures and text descriptions to determine!Package Includes10 x Cutting Disc2 x Mandrel