Feature:1. Application: 415 chain tensioner kit fits for 2 Stroke Motorized Bicycle; Fit for 49cc 66cc 70cc 80cc Motorized Bicycle Push Bike Engine Kit.2. High Performance Tensioner: Tensioner can keep the chain in the transmission process, with appropriate tension, so as to avoid the chain slip, avoid the occurrence of jumping teeth, stripping teeth and disengagement.3. Durable Construction: Chain tensioner kit is made of metal and ABS material, high hardness, wear resistance, rust resistance, to ensure long term stable use.4. Easy Installation: Motorized bicycle chain is simple to operate, no drilling or cutting required. Will not damage the original accessories.5. Rigorous Testing: This door lock actuator has been extensively tested for quality and safety performance, strong reliability, making sure safety use.Specification:Item Type: 415 Chain with TensionerMaterial: Metal + ABSFunction: Keep the chain can have proper tension during transmission, so as to avoid the chain slipping, or avoid the occurrence of jumping teeth, stripping teeth and disengagement.Fitment:Fit for 2 Stroke Motorized Bicycle Fit for 49cc 66cc 70cc 80cc Motorized Bicycle Push Bike Engine Kit.Package List:1 x Chain 1 x Tensioner