1. This main jet for carburetors is specially designed for carburetor modification, and one set contains 15 pieces. Its unique design can better meet the needs of carburetor modification and bring remarkable effects to the performance improvement of carburetors. 2. Its size is 6 millimeters. The precise specifications ensure good adaptability during the carburetor modification process and contribute to more accurate adjustment of fuel supply. 3. It is widely compatible with various vehicle models, such as PWK, PE, CVK, etc., and is also compatible with the main jets of PHBG VHBT racing cars, which can meet the carburetor modification requirements of different vehicle models. 4. It has an authorized self - owned brand, which can ensure the product quality and is an ideal choice for carburetor modification. The main sales regions cover Africa, Europe, South America, Southeast Asia, North America, Northeast Asia, the Middle East, etc., and it is well - received by consumers in different regions. Whether you are a racing enthusiast pursuing high performance or have the need for daily vehicle carburetor modification, this main jet for carburetors can perform well and bring better performance to your vehicle.