"This Oregon 4 1/8in. diameter grinding wheel leaves a precision finish on saw chain and work with our Oregon Mini Grinders Item#s 19301 and 193061. Single grinding wheel included. Chain Pitch in. 1/2, Wheel Diameter in. 4 1/8, Wheel Thickness in. 1/4, Bore Diameter in. 7/8. For 1/2in.-pitch chains 7/8in. shaft diameter 1/4in. wheel thickness"
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