The Tanaka 6689465 Trimmer Drive Shaft transfers rotational power from the trimmer engine to the cutting head for effective operation. Designed as a replacement drive shaft, it supports smooth power transmission through the trimmer shaft assembly while helping maintain proper connection between internal drive components. A worn or damaged drive shaft can affect cutting performance and... https://www.wholetoolbox.com/tanaka-6689465-trimmer-drive-shaft/6689465.html