Norton Toolroom Wheel, Straight, Series: 5SG, 8 in Wheel Diameter, 1/2 in Wheel Thickness, 1-1/4 in Center Hole, 46 Grit, Medium Grade, Ceramic Alumina/Friable Aluminum Oxide Abrasive, 3600 rpm Maximum, Wheel Hardness: J, 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