Fitment:For MS271 MS291 Series ChainsawsReplace Part # for 1121 640 2001Type: .325″Pitch,-7 Tooth.Note: This item do not fit the part number 1121 640 2000Description:-Highest after-sales guarantee-Low cost,Highest cost performance-Brand New High Quality Durable and easy to installPackage Include:1 x Clutch Drum1 x Clutch Assembly1 x Washer1 x E-clip1 x Needle BearingNotes??-If You Are Not Sure The Item 100% Fit For Your Vehicle Before Your Purchase.-Please Allow 1-3CM Differs Due To Manual Measurement.-Due To The Different Display And Different Light, The Picture May Not Reflect The Actual Color Of The Item. Thanks For Your Understanding.