Zhenjiang Speed Horse Machinery I&e Co., Ltd. is based in China and lists products such as Type-A Marine Manhole Cover, Marine Aluminium Pipe Vertical Ladder, Marine Single-Leaf Aluminum Weathertight Door, Marine Wheel House Sliding Door, Quick Action Anti-pressure Watertight Steel Door, and Customized Marine Door on Global Trade Plaza. The company lists 2005 as its year of establishment. The supplier offers manhole covers made of casting iron with options in marine steel, stainless steel, aluminum alloy, and copper materials, featuring rubber gaskets with a three-year warranty and stainless steel screws. Ladders are constructed from aluminum with step counts ranging from 2 to 12 and deck heights from 800 to 4000 mm, compliant with CB/T670-94 standard. Doors include single-leaf aluminum weathertight models rated for up to 4m water pressure, sliding doors in aluminum alloy, FRP, or stainless steel, and quick-action steel doors tested to withstand 0.16Mpa internal pressure. Custom marine doors are produced per customer specifications for size, color, materials, and opening type.