a cable clamping device of the rotary jaw type , including a hook - shaped female member adapted to be mounted on a support , and a male member of symmetrical cross - section with a cylindrical head adapted for rotation within the female hook . cable - receiving bores in the male and female members and a separate clamping surface on the female shank cooperate to clamp the cable . size or force adjustability is provided by making the axis of the male bore non - coincident with the axis of symmetry of the male member , and rotating the latter about its axis of symmetry . cam - locking means are provided to create a resilient clamping pressure on the cable prior to closure , and to ensure positive locking of the device upon complete closure .