Size Arbor Grit Maxrpm Type 4-1/2? 5/8-11 36# 40# 60# 80# 120# 13300 T27 T29 5? 5/8-11 36# 40# 60# 80# 120# 12000 T27 T29 7? 5/8-11 36# 40# 60# 80# 120# 8600 T27 T29 Characteristics: * Quick and easy mounting and removal. * Stock Remove and blending in same operation * Overlap flaps designed for difficult ?to reach welds in corners or angles.