Brand NORTON Manufacturer Part Number 57A Series Wheel Type 1 Diameter 12 inches Thickness 2 inches Tree Hole Size 1-1/2 ing. Reducing bearing size included 1-1/4 inch. Type of tree hole Hole without thread Abrasive material Aluminium oxide Abrasive grade Grain Grain 46 Wheel hardness M Type of bondvitrified Specification 57A46-MVBE Primary material application Aluminium Brass Bronze Cast iron Copper Nickle alloy Stainless steel Stainless steel Titanium Steel Tool Type of instrument Compatible tone Barrel