DeWalt DW8424-25 4-1/2" x .045 x 7/8" Cutting Wheel for Metal 25/Pack Two full sheets of fiberglass for durability and safety Proprietary material mix to ensure premium cutting speed Premium resin bonds are 100% inspected before use for product consistency and quality Maximum safe RPM's: 19000 Arbor: 7/8" Package of 25 Ships by UPS Only