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 Proprietary material mix ensures durable long life wheels High performance aluminum oxide grain for long life and high material removal High grain concentration for aggressive grinding action and smoother running wheels 3 full sheets of fiberglass for durability and safety Includes(1) Grinding WheelProp 65No Maximum Speed: 12200 RPM Wheel Diameter: 5 in Thickness: 0.25 in Arbor Size: 5/8 - 11 Weight: 0.610 lbs Material: Aluminum Oxide Reinforcement: 3 sheets fiberglass Grit: Coarse Country of Origin: China