... Steel, Alloy metal, efficient, durability, economical. Product name: flexible grinding wheel/flexible grinding disc/flexible abrasive discProfessional using in Stainless Steel, Nickel, Aluminum, Tungsten ... CertificateSize 4"x1/8x5/8" 4.5"x1/8x7/8" Flexible Grinding wheel for Stainless Steel, Alloy Steel