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Oregon pro spur sprockets are durable, economical, and built to last. The chain-driving portion of the sprocket, and the clutch cup, are a single component and are all replaced together when a new spur sprocket is installed. The Pro Spur is made from quality heat treated steel and is popular for small professional chainsaws. Drive sprocket is .325" pitch with 7 teeth. Drive sprocket bearing included. Fits the following chainsaws: Echo: CS-400EVL, CS-400EVLP, CS-440EVL, CS-510, CS-520, CS-530, CS-3600, CS-3900, CS-4400, CS-5100 (after SN 134504) Replaces Echo Part Number: 175105 14630 John Deere: 45 Fits Crankshaft Diameter .3937 (10mm) Drive Sprocket Bearing ORF 37509