The Husqvarna 503872601 Clutch Drum Assy is a genuine OEM replacement part designed for various Husqvarna, Jonsered, and McCulloch chainsaws. This essential component of the clutch assembly is a metal, cup-shaped part that houses the clutch shoes and rotates with the chain, transferring power from the engine to the cutting chain. Replacing a worn or damaged clutch drum ensures proper chainsaw performance and efficient power delivery. Compatible with models such as Husqvarna 340, 345, 346XP, 350, 351, 353, 445, 450, 450 E-series, 450 Rancher, 455 Rancher, 460 Rancher, 461, 545, 550XP, 550XP Mark II, 555, 560XP, Jonsered 2145, 2150, 2152, 2153, 2156, 2159, CS 2145, CS 2150, CS 2152, CS 2153, CS 2156, CS 2159, CS 2245, CS 2250 S, CS 2252, CS 2253, CS 2255, CS 2258, CS 2260, and McCulloch CS450.