Pro Spur Sprocket / 3/8" Pitch, 7 TeethPack Size:1Carlton 6-34162X, GB ST316-A7N, Herr 193-A7, Ref No SST316-37N, Stihl 1125 640 2004, Stihl 1125 640 2000NHC 085-2697, Oregon 38145X, Oregon 57-194, Rotary 1619, Stens 085-269, Tilton T193A7Stihl 029, 034, 036, 039, MS290, MS360, MS361, MS390, 034 Super and MS310Crank Diameter: 10 mm, Drum ID: 2.985 ", Teeth: 7