1、Fitment: Professional manufacturing, chainsaw clutch drum bearing kit is suitable for CS4200 CS4000 CS4100 CS4106 CS4280 Chainsaws. 2、Function: Crank hole diameter is about 13mm / 0.51in, making the chainsaws work smoothly, you can directly replace your worn or damaged one. 3、Durable Material: Clutch drum needle bearing set is made of premium metal material, high hardness, wearproof and durable, not easy to break. 4、Package Including: The package includes 1pc spur sprocket clutch drum and 1pc needle bearing, easy to install and operate, reliable to use. 5、Long 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 Sprocket Clutch Drum Material: Metal Crank Hole: Approx. 13mm / 0.51in Fitment: Fit for CS4200 CS4000 CS4100 CS4106 CS4280 Chainsaws 1 x Clutch Drum 1 x Needle Bearing