The rear handle CS-4510 is an easy-to-use, mid-range saw with a spring-assist starter to reduce starting effort and 3-point spring vibration reduction system for operator comfort. The side-access chain tensioner offers easy chain adjustment and the translucent fuel tank clearly indicates fuel level. Rear handle, 18" Bar, 45cc, 11 lbs, Use REC20BPX72CQ chain. Rear Handle.