The new design concept features complete enclosure of the TKA55, effectively preventing foreign bodies from entering. An optimized sideband and cover shape effectively prevents functional impairments caused by chips and dirt entering into or sticking to the cable carrier. The compact new design of the covers allows them to fit seamlessly into one another, protruding over the sidebands to form a compact, closed unit. This ensures a secure grip even in the case of extreme mechanical loads. The smooth, dirt-repellent shape of the sidebands also prevents the intrusion of any foreign bodies. TKA – design and function at one.