Fitment: Chain Slider Tensioner Adjuster Roller Guide Fit For ATV Coolster Go Kart 4 Wheeler 110cc 125cc 150cc 200cc 250cc That Use 420 428 And 530 Chain High quality??Spring loaded chain tensioner that keeps chain from popping and snapping.Thicken metal, not easy to bend deformation. Good working condition and easy to install. Size: Tensioner aperture: 10mm/0.4inch??diameter: 35mm/1.4inch??Width: 34mm/1.33inch Package Include: 1 Chain Tensioner Adjuster??1x spare spring chain tensioner Guide wheel Professional after-sales??We sell professional auto parts ??and provide free technical support. If you have any problems or dissatisfaction after receiving the products, please contact us directly to get New Replacement or Return.