The Husqvarna 503771801 is a genuine OEM clutch drum kit designed for Husqvarna chainsaws. This essential component features a 3/8-inch pitch and 7-tooth sprocket, ensuring optimal power transfer and smooth operation. It is a direct replacement part for various Husqvarna chainsaw models, including 340, 345, 346XP, 350, 351, 353, 445, 450, 450E, 455, 455E, 460, and 461. Replacing a worn clutch drum maintains chainsaw performance and safety, providing reliable operation for demanding tasks.