8 - 16mm clamping range. These are our Norma heavy duty W4 worm drive clamps that are manufactured completely from 304 grade stainless steel so they will not rust. The Norma W4 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 calmps is smooth and rounded so the clamps will not cut your fingers or damage the pipe when fitted correctly. 9mm wide smooth edged band with a clamping range of 8 - 16mm. The price here is per clamp with a minimum of 4 to be ordered.