Stepless clamps are built to tighten in an exact circle around the hosing; simply crimp (not squeeze) the stepless clamp closed with a crimping tool or the middle cutter on your pliers.
With these stainless steel stepless clamps, we can spruce up your crimp. Because of the thicker internal wall, these 7-10mm clamps will suit our 4mm ID beer line.

Many home brewers use worm drive hose clamps, which are convenient because they can be reused, but they don't perform very well on beer lines. The worm drive has a tendency to pinch the line on one side, causing the hose to leak or lowering the system's pressure holding power.

These stepless clamps are significantly better because they form even compression around the whole diamater of the line. This makes a much better and more reliable connection.