Solid Steel Convex Diamond Grinding Wheel: 4″ in Diameter x 1/2″ Wide, 1″ Hole. Order optional bushings if you have a 1/2″, 5/8″ or 3/4″ arbor (for this wheel order one 1/2″ wide bushing to make the 1/2″ span across the hole). High quality nickel plated diamond on steel
Grit sizes available: 80, 120, 220, 400, & 600 grit
Cautions: Maximum Speed Rating: 2800rpm. Always wear safety goggles. Always wear an appropriate mask so you do not breath in particulates and harmful vapors. Always wear hand and body protection. Failure to adhere to these cautions may result in serious injury or death.