Crafted from high-performance aluminum oxide grain for durability and optimal material removal, DEWALT Type 27 HP Metal Grinding Wheels grind and shape a variety of metals and non-ferrous materials. High grain concentration for aggressive grinding action and smooth-running wheels.Features High grain concentration for aggressive grinding action and smoother running wheels High performance aluminum oxide grain for long life and high material removal Proprietary material mix ensures durable long life wheels 3 full sheets of fiberglass for durability and safety Prop 65NoIncludes(1) Grinding Wheel Maximum Speed: 6600 RPM Wheel Diameter: 9 in Length: 9 in Width: 9 in Height: 1 in Arbor Size: 5/8 - 11 Thickness: 1/4 in Weight: 1.771 lbs Grit: Coarse Material: Aluminum Oxide Reinforcement: 3 layers fiberglass Country of Origin: China