For use with 7-1/2" polishing pad Nos.49-36-0500, 49-36-1450 (SKU 415.4688), 49-36-1455 and Bonnet No.48-48-0500. Disc Nut No.49-50-0390 is required to attach Nos.49-36-0500, 49-36-1450 (SKU 415.4688) and 49-36-1455 to this backing pad. Bonnet No.48-48-0500 ties to this pad.