Abstract: An apparatus for clamping metal concrete forms. The clamping apparatus includes a clamp body (10) and wedge (20). The clamp body includes two opposed sides (16) and (18) that define a tapered slot for receiving the wedge therebetween. The clamp body also includes an opening or mouth (12) that is operative to receive one or more work pieces which may be clamped together with the apparatus. The wedge is operative to move between a first position and a second position with respect to the clamp body. As the wedge slides between the first and second position within the slot, a front upper surface (22) of the wedge is operative to urge the work pieces against a jaw surface (15) of the clamp body that bounds the upper portion of the mouth. Also as the wedge slides toward the second position, the upper side wall portions (34) and (36) of the wedge slide adjacent a narrower portion of the slot (28).