Stadea Series Standard K – Diamond polishing pads set with foam backing pad for Granite Quartz Marble Concrete Stone Travertine polishing. 5 Step polishing pads set save polishing and fabrication time, one each for grit 50, 150, 500, 1500, 3000 and one piece backing pad with 5/8″ 11 thread. Never run over 5000 rpms for safe usage and optimal performance.