the present invention provides a clamp assembly which allows the surgeon to snap a bone fixation assembly onto a bone fixation rod at an intermediate location along the length of the rod . it is not necessary to “ thread ” the clamp onto the rod starting at the end and sliding it down the length of the rod to the desired location . in particular , this invention provides a novel clamp assembly for use with standard bone fixation rods , and bone pins . the clamp allows the interconnection of a bone fixation rod with a bone pin locking assembly including a bone pin vise . the clamp is a single - piece construction , having a jaw capable of loosely capturing the bone fixation rod when the surgeon presses the jaw onto the rod . the assembly may be rigidly fixed to the rod using a bolt which tightens the jaw onto the rod .