Plated Carbon Steel Spiral Clamps are suitable for use with Smooth external surfaces but mainly for the use with hoses with a corrugated sprial cover such as vacuum hoses etc. Available in Left & Right hand Spirals. To tell which way your hose spirals simply look down the end of the hose. If the helix winds away from you in a clockwise direction away from you, you need a right hand spiral clamp. If its is anticlockwise you need a left hand clamp.