Makes quick work of pruning trees and shrubs. Side-access chain tensioner makes it easy to adjust the chain. Oil tank cap with retainer helps keep you from losing the cap.Optional shaft extension. Extends shaft by 37".Attachments can be quickly changed without tools. Fits FS 55 RT, FS 83 RT, FS 85 RT, KM 55, KM 85, and KM 110.