Match type: The arm bracket design for GY6 50 80cc Scooter ATV 139QMB 137 QMACam. Sturdy material: Cam holder bracket is Made of aluminum alloy material, wear-resistant, anti-corrosion and high strength for long time use. Where to use: This arm assembly is an essential part of engine, easy to install and use. A direct replacement for the old or broken one, professional installation is better. Size: This is a 64mm arm holder assembly, when you purchase, please check the size first. Customer Service: We promise that we always provide quality service with our customers. When you receive the goods, please check the package in time. Please feel free to contact our customer service if you encounter any problems. Specification: Condition: 100% Brand New Material: Aluminum Alloy Color: As Pictures Shown Fitment: Fit for GY6 50 80cc Scooter ATV 139QMB 137 QMACam Package list: 1 * 64mm Arm Holder Assembly