Norton Toolroom Wheel, Straight, Series: 5SG, 10 in Wheel Diameter, 1 in Wheel Thickness, 3 in Center Hole, 60 Grit, Medium Grade, Ceramic Alumina/Friable Aluminum Oxide Abrasive, 2485 rpm Maximum, Wheel Hardness: I, Vitrified Bond, Applicable Materials: 400 Series Stainless, Hard Carbon Steel, Tool Steel, Titanium, Super Alloy, Cast Iron, Ductile Iron and Gray Iron, Blue Wheel, Wheel Type Number: Type 1