Stylemafia Heavy Duty Chain Roller Tensioner w/Spring 110cc 125cc 140cc Dirt Pit Pro Dirt Bike 4 wheeler Black Heavy duty chain roller tensioner with upgraded spring, thicker wire and longer travel. The bracket use 3.1mm thick metal, stronger built than other tensioners.Seamless steel bushing brings smooth rotoring and longer life. 15mm inner diameter mounting bushing size, please see photos for detail measurements. package includs:2 x rollers,1 x bracket, 1 x clip spring, 1 x screw Professional after-sales：Please check the description to confirm the compatibility before purchase. Thank you! if you have any problems or concerns, please kindly send us mail any time, we are always here to provide you 100% satisfied after-sale service.