300 series reel, made of high-quality carbon steel, spring driven, automatic recycling, instant locking, powder coating on the surface, with strong corrosion resistance, compact appearance, beautiful and lightweight, strong structure, durable, can be used to transport all kinds of water, oil, compressed air and other media, as a storage tool for pipelines, especially suitable for installation on special vehicles such as maintenance vehicles, refueling vehicles, water trucks, testing vehicles with high requirements for space constraints, as well as factory workshops, car beauty and other suspension installation use.