DEWALT DWA4530 T27 Metal Cut-Off Wheel, 4-Inch x .045-Inch x 5/8-Inch Thin .045" wheel design for fast burr free cutting. Softer Aluminum Oxide formulation for faster cutting. 2 full sheets of fiberglass for durability and safety. Thin .045" wheel design for fast burr free cutting Softer Aluminum Oxide formulation for faster cutting 2 full sheets of fiberglass for durability and safety