PSA Sanding Disc, Abrasive Type Coated, Abrasive Material Aluminum Oxide, Backing Material Cotton, Backing Weight X, Coating Coverage Closed, Grit 60, Overall Diameter 5 in, Product Type PSA Disc, Series R228, Resistance Properties Heat, Number of Vacuum Holes Non-Vacuum, Color Brown, Grade Coarse For maintenance and repair applications, from medium grinding to light deburring and finishing. Pressure-sensitive adhesive (PSA) offers fast, convenient disc mounting. Discs are made without center holes for full-face usage. 8" discs and smaller are designed for use on orbital sanders or vertical shaft grinders and must be used with PSA back-up pads.