Feature:The tensioner keeps the timing chain at the correct tension at all times by reducing vibration and noise while improving shifting performance for a smoother ride.The tensioner keeps the chain at its proper slack so the chain won't easily wear down the motor case bearings, inner main bearings or clutch hub bearings.Easy to install without dismantling the main chain.This is a non-OEM product, accessory only! Specification:OE Number: M6-BT07Color: Silver ToneMaterial: MetalPlastic Cap Size: 7.5x4.5x2.5cm / 2.95"x1.77"x0.98"(L*W*H)Metal Bracket Size: 12x4.5cm / 4.72"x1.77"(L*W)Long Spring Size: 1.4x3.7cm / 0.55"x1.46"(D*H)Short Spring Size: 2x3cm / 0.79"x1.18"(D*H)Gasket Size: 5.1x4.5cm / 2.01"x1.