The T 4 Tuning Tube is a heat-shrinkable sleeve that can be attached to the shank of your hook to optimise lure hold and personalise your rig. It can also be used to attach your assist hooks for light jigging. It has an extraction rate of around 50% and is available in several diameters to suit different types of hooks. The length of the tube varies according to the diameter: 1 m for sizes 0.8 mm / 1.0 mm / 1.5 mm and 80 cm for sizes 2.0 mm / 2.5 mm / 3.0 mm.