Hose clamps are used to connect hoses with a coupling or to fix a different connection. A hose coupling like Storz for example has a so called hose connector which has a bulged surface to secure and fix the hose against sliping.
If higher pressure are used than so called muffler clamps are used. The hose is tightly fixed by a securing ring of the muffler clamp if appropiate installed.
Function:
The inner diameter of a ring shaped metal band or a ring shaped wire is diminished by turning the screw. The hose end is equally pressed on the hose connector.
Construction sites or workshops which can not foresee the diameter they will work with it is recommended to use endless clamp. To the endless band you can purchase the corresponding tensioning tools.