How big is the full shaft screw of Longxin tricycle?

16 mm. Henan Longxin Locomotive Co., Ltd. belongs to Longxin General Power Co., Ltd., and Longxin tricycle is its product. Full-axis screw size 16 mm, listed in 2009, the market price is 4500 yuan. The company is engaged in the research and development, manufacturing, sales and foreign trade of three-wheeled motorcycles, new energy vehicles and their parts.