Features: Multifunctional-blade: our grinding plate is suitable for marble, concrete, ceramic-tile and floor tools. Flat and wear-resistant: our grinding discs are made of diamond-gravel and a variety of metals by hot pressing. Grind smooth. Thickened-cutter head: our grinding plate adopts 65Mn as a whole, with overall heat-treatment, and the thickness can reach 7mm. Easy to Use: Just take out the grinding-disc and use it in your work, a very convenient set for you. Rust Proof Set: This grinding-disc adopts high qquality material which will avoid rust well. Specifications: Application: 150Angle-grinder Size:4 inches, 17.40 * 11.90 * 1.40cm Material: Manganese steel 65 + cutter-head alloy steel Scope of Application: Concrete, marble, all kinds of ceramics includes: Package Contents: 1 *Thickened Diamond Bowl Grinding-Disc