Item Type: Chain Slider Tensioner Roller Material: Steel alloy + ABS Applicable Chains: 420, 428, and 530 chains Application: Aftermarket replacement for the original spring bearing chain idler tensioner and pulley Function: Protects the swing arm and helps guide the chain correctly, prevents chain derailment and sprocket excessive wear, prolongs chain life Fitment: Fits ATV Coolster Go Kart 110cc, 125cc, 150cc, 200cc, 250cc Package List: 1 x Chain Slider Tensioner Adjuster 1 x Axle 1 x Spring 1 x Replacement Roller Perfect Fitment: Chain slider tensioner roller fits ATV Coolster Go Kart 110cc, 125cc, 150cc, 200cc, 250cc, precise matching High Quality Material: Chain tensioner guide is made of high quality steel alloy and ABS material, rustproof, wear resistant, sturdy and durable Excellent Performance: Chain roller guide tensioner is not easy to oxidize, deform or bend, offers stable performance and high reliability Professional Design: Professionally manufactured with fine workmanship, helps keep chain from popping or snapping, provides long service life Easy Installation: Easy to install, allows for chain adjustment, convenient to use, saves time and effort