Calcined Aluminium Oxide gives a higher performing, longer lasting, abrasive grain making it an excellent abrasive choice for working with steel, stainless steel, aluminium and non-ferrous metals. Grit: 40 Size: 115 x 22.2mm Max RPM: 13,300 - 80m/s EN 13743 80 Flaps 10 discs in shrink wrapped pack