20 - 32mm clamping range. These are our Norma heavy duty W5, all 316 stainless steel worm drive clamps that are manufactured completely from 316 grade stainless steel so they will not rust and are very suitable for use in marine or heavy weather applications. The Norma W5 range is the range of clamps that we use in the field as even our strongest staff cannot break them using a flexible driver for tightening. These are an excellent clamp for use on fuel lines, water hoses and in nearly any other clamping application. The edge of these clamps is smooth and rounded so the clamps will not cut your fingers or damage the pipe when fitted correctly. A 12mm wide smooth edged band with a clamping range of 20 - 32mm, the outside of the pipe needs to be within this range. The price here is per clamp with a minimum of 4 to be ordered.