Description:* *Easy installation and *A perfect aftermarket replacement*Suitable for Stihl 024,MS240,026,MS260,MS260 PRO,MS261,MS270,MS280,MS271,MS281,MS291 Chainsaw*Replace part number 1121 160 2051,1121-160-2050*Rim Sprocket Type :.325"Pitch, 7 Tooth. Small 7 , 19mm Inner HoleNeedle Bearing : 10x13x10 MMPackage Includes:1 x Clutch Drum1 x Rim Sprocket1 x Clutch Washer1 x Needle Bearing1 x E-clip Note:1.We provide clear pictures, measurements where possible. Please check as much as possible to make sure the item is the one that you need.2. Please allow 0.5-1 inch difference due to manual measurement. (1inch=2.54cm)3.There are no instructions included in this kit. If you want to know how to use or install it,please us by Email.We will provide help as much as possible.