Features Fit Stihl MS660,066 Directly, Big Bore for 064,MS640,065,MS650 Chainsaw parts. Diameter: 54mm Replace Part # for 1122 020 1211, 1122 020 1209 Package content: 1 x Cylinder, 1 x Piston, 1 x Pin, 2 x Ring, 2 x Circlip,1 x Cylinder Gasket, 1 x Muffler Gasket. Product DescriptionHigh quality products and excellent service, you can deserve it! Fit Stihl MS660,066 Directly, Big Bore for 064,MS640,065,MS650 Chainsaw parts. Diameter: 54mm Replace Part # for 1122 020 1211, 1122 020 1209 Package content: 1 x Cylinder, 1 x Piston, 1 x Pin, 2 x Ring, 2 x Circlip,1 x Cylinder Gasket, 1 x Muffler Gasket. Please compare the product with your original item according to the pictures , make sure that the product type and size fit your need. Any need or question, please don't hesitate to contact with us and we will feel free to help you solve at the first time.