Rex-Cut Abrasives 739150 Sigma Green Max Grinding Wheel, 36 Grit, 4-1/2in Dia. x 1/4 Thick x 5/8-11 Arbor (Pack of 10). Sigma Green Max is the 1/4" thick version of our highly successful Sigma Green wheel that has been engineered for added life and durability. The specialty bond results in a balanced, noticeably quiet, and smooth running grinding wheel with less vibration, even with the added thickness. Benefits: Longer life, high performance zirconium and aluminum oxide grain combination, fast stock removal, superior finish, grinds smooth and quiet, minimizes operator fatigue, controlled grinding, cool cutting, won't discolor or warp stainless steel, reduces labor rates. Applications: Founderies, general fabrication, shipbuilding, tank fabrication, power plant maintenance and repair. Use with Angle Grinder. 4-1/2" Diameter x 1/4" Thickness x 5/8-11 Arbor, 13, 300 Max RPM.