This unique design utilises a pair of stainless-steel ball bearings that are pushed together under tension by twisting the top of the clip. When fully tightened, the stainless steel balls offer outstanding grip on the thinnest of braided main lines when heavy indicators are required using add-on weights. They are equally at home using light heads without any weight, which allows the line to flow freely through the head with minimal resistance on a take. No tools are required for adjustment; simply twist to the desired tension.