Special designed jaws to prevent internal hose linings from damage. Lightweight and easy to use. Being non conductive can be left loose in an engine without fear of shorting out. 3 sizes to fit all types of hoses. How to use: Select the correct clamp for your hose. Squeeze the clamp so the pipe is totally sealed. To hold the position simply for hands free move the clamp handle clip into its tightest ridged position and your pipe is sealed with hands free. For hoses of the following sizes 1/4-3/4 1/4-1 1 and 3/4-2 1/4 Inch. Please note:Colour may vary. Specifications: Small Brake / Fuel Hose Clamp 1/4-3/4 inch 160mm length. Medium Heater Hose Water Pipe Clamp 1/4-1 1/4 inch 180mm length. Large Radiator Hose Water Pipe Clamp 3/4-2 1/4 inch 250mm length. Made from shatter proof Nylon composite.