Feature 1Fitment: Professional manufacturing, chainsaw clutch drum bearing kit is suitable for CS4200 CS4000 CS4100 CS4106 CS4280 Chainsaws. 2Function: Crank hole diameter is about 13mm / 0.51in, making the chainsaws work smoothly, you can directly replace your worn or damaged one. 3Durable Material: Clutch drum needle bearing set is made of premium metal material, high hardness, wearproof and durable, not easy to break. 4Package Including: The package includes 1pc spur sprocket clutch drum and 1pc needle bearing, easy to install and operate, reliable to use. 5Long Service Time: Exquisite and careful workmanship, it can be used for a long time, saving your cost, do not need to change frequently.Item Type:Spur SprocketClutchDrumMaterial: MetalCrank Hole: Approx. 13mm / 0.51inFitment:Fit for CS4200 CS4000 CS4100 CS4106 CS4280 Chainsaws .wang-edit-text{ font-family:'Arial' !important; } .wang-edit-text table { border-top: 1px solid #000; border-left: 1px solid #000; } .wang-edit-text table td, .wang-edit-text table th { border-bottom: 1px solid #000; border-right: 1px solid #000; padding: 3px 5px; } .wang-edit-text table th { text-align: center; }Package List1 x Clutch Drum1 x Needle Bearing