Chain Roller Tensioner Adjuster for 110cc 125cc 150cc 200cc 250cc 300cc ATV Quad 4 Wheeler Go Kart Taotao Sunl Peace 420 428 Chain Brand new chain roller tensioner with spring Fit most 110cc 125cc 150cc 200cc 250cc ATVs and go karts Fit almost all Chinese and Japaneses brands Diameter of bolting hole: 10mm (weld on a 10mm or 3/8" stud); Diameter of roller: 40mm; Length of roller: 29mm