Steel and Harder Steel Grades, Wheel Type Number: Type 1, Wheel Hardness: S, For Use With: Cut-Off Die Grinder, Right Angle Air Die Grinder and Right Angle Grinders, Reinforced: Yes, Specifications Met: ANSI B7.1-2010.Weiler’s diverse line of cutting wheels provide a consistent, well balanced, high quality solution. From our thin cutting wheels that slice through metal, to our large diameter wheels for the biggest cuts, professionals get the most demanding jobs done right and done fast.