4-1/2" x .045", Cutting Wheel, X-Lock, Thin Metal & Stainless Steel Cutting Wheel, T1 Heavy Duty, 5X Faster Wheel Change, Reliable Mount, More Durability, Abrasive Wheels Compatible With 7/8" Arbor Mounts, High Quality Bonds Feature Optimized Grit For Fast Cutting, Wheel Change Features Snap-On Mounting & Grinder Lever Wheel Release.