Kant Twist 415 Deep Throat Jaw Opening Clamp, 4-1/2" Holding Size, 7" Length x 6-3/4" Width, 1700 lbs Holding Capacity Deep throat clamps allow for a deeper grab on the clamped objects Multi-purpose clamps combine the best features of ordinary "C" and parallel clamps Free-floating jaws adjust to un-parallel surfaces, will not "walk off-center" when pressure is applied against jaw, because there is no unsupported screw or loose pad All clamps are of rugged construction Plates are made of high tensile steel