Pro Spur Sprocket / 3/8" Pitch, 7 TeethPack Size:1Carlton A7-HO-311-SS, GB HO113-A7N, Herr N148A7, Homelite A 95459, Oregon 17-102, Oregon 30681X, Ref No SHO113-37NNHC 085-0577, Oregon 57-102, Prime Line 7-05122, Quality 500-N148A7, Rotary 1646, Sandvik HO34A7Homelite XL12 (after serial #1735838) SUPER XL, XLAO, XL400, XL500, XL800, SXL925, VI944, VI955, 450, 550 and 923Crank Diameter: 5/8 ", Drum ID: 3.100 ", Teeth: 7, Bearing included