Norton Toolroom Wheel, Straight, Series: 39C, 7 in Wheel Diameter, 1/2 in Wheel Thickness, 1-1/4 in Center Hole, 100 Grit, Fine Grade, Silicon Carbide Abrasive, 3600 rpm Maximum, Wheel Hardness: I, Vitrified Bond, Applicable Materials: 300 Series Stainless, Titanium, Aluminum, Brass, Bronze, Copper, Gray Iron, Masonry and Natural Stone, Green Wheel, Wheel Type Number: Type 1