Size Grit Maxrpm Type 1? 36# 40# 60# 80# 120# 30.000 R 1-1/2? 36# 40# 60# 80# 120# 30.000 R 2? 36# 40# 60# 80# 120# 30.000 R 3? 36# 40# 60# 80# 120# 25.000 R Characteristics: Ideal disc for deburring,blending,and cleaning on flat or contoured surface of ferrous and non-ferrous metal offer type R?attachment options to allow for quick and easy operator assembly suitable for 1/4?Drive Angel Grinder. Die Grinder,