Features: 1.Wide Application: The carburetor main jet is a wonderful replacement for GY6 50cc 139QMB Scooter and replacement for Keihin Carb PZ19 to meet your needs. 2.10PCS Total: The carburetor nozzle set includes 40, 42, 44, 45, 46, 48, 50, 52, 55 and 58 10 in total different kinds of size, sufficient quantity for you to replace. 3.High Quality Materials: The carburetor main nozzle is exquisitely made of advanced metal material without any burrs or other noticeable defects. 4.Perfect Match: The carb nozzle set is designed according to the original standard for perfect fitness, direct replacement for the old or broken one. 5.Easy to Install: The heavy duty carb main jet is specially designed with simple structure for convenient installation without any complicated tools. Specification: Item Type: Carburetor Main Jet Material: Metal Models: 40, 42, 44, 45, 46, 48, 50, 52, 55, 58 Fitment: Replacement for GY6 50cc 139QMB Scooter Replacement for Keihin Carb PZ19 PackageList: 10 x Carburetor Main Jet