Hose fittings are a category of components used to connect hoses and tubes for in-line, offset, multi-port, and mounting configurations. Typically, hoses and tubes are configured with straight sections connected by fittings or specially-formed connections and joints. Fitting construction and material selection is application-dependent. Some hose fittings rotate or swivel on one or both ends. Others can be disconnected and reused as necessary. Hose fittings are available in both English and metric measurements. English sizes include fractional, inch-based measurements such as 1/16, 3/32, 1/8, 3/16, 1/4, and 1 1/4. Whole-inch measurements between one and ten inches are also available. Metric hose fittings are usually measured in millimeters; however, some centimeter-based devices are also available. Important measurements for hose fittings include inside diameter (ID) and outside diameter (OD). Both must match the connecting line.