The United Abrasives/Sait 36 Grit PSA Aluminum Oxide Grain Adhesive Coated Disc has 5" Dia and is featured with a closed coat structure. Pressure sensitive disc is specially developed with X-weight Egyptian cotton cloth backing making it ideal for ferrous and/or non-ferrous metals like iron, steel, aluminum, copper, stainless steel and high tensile steel. Disc including hot melt adhesive back permits for quick change and less downtime. It also features strong resin over resin bond construction that is resistant to heat and moisture, sold as 50 per pack.