polishing disc for polishing metal, paintand automobile,suitable for most electric angle grinder/sander/polisher machice Pneunetic grinding discAbrasive Tool of Grinding Disc is made of PU material.Features: 1) Specification: 4", 4.5", 5", 6", 7" 2)Thread: M10, M14,M16, 5/8.polishing disc polishing disc