Norton Toolroom Wheel, 1-Side Recessed, Series: 3SGR, 7 in Wheel Diameter, 1 in Wheel Thickness, 1-1/4 in Center Hole, 46 Grit, Medium Grade, Ceramic Alumina Abrasive, 3600 rpm Maximum, Wheel Hardness: H, Vitrified Bond, Applicable Materials: 400 Series Stainless, Hard Carbon Steel, Tool Steel, Titanium, Super Alloy, Cast Iron, Ductile Iron and Gray Iron, Ruby Wheel, Wheel Type Number: Type 5