The STIHL 11251602052 is a genuine OEM clutch assembly designed for various STIHL chainsaw models, including 029, 039, MS 290, MS 310, and MS 390. This essential component is located on the crankshaft and is responsible for engaging the clutch drum to drive the saw chain. Regular replacement of a worn or damaged clutch assembly ensures proper chain operation and maintains the performance of your STIHL chainsaw. It measures approximately 69.85 mm in length, 69.85 mm in width, and 19.05 mm in height, with a weight of about 0.127 kg.