Clutch drum bearing kit for Stihl MS271 MS291 MS261 MS261C MS271C MS291C MS240 MS260 MS270 MS280 chainsaw. Replacement OEM numbers 1141 640 2001,1121 160 2051.9512 933 2260 Sprocket rim: 0.325" pitch, 7 teeth. Package includes: 1x clutch drum, 1x clutch assembly, 1x roller bearing needles, 1x washer, 1x E-clamp as shown in the picture. The replacement parts are of high quality, please compare your original model carefully with our product photos and details to avoid model problems.