Designed with safety in mind, the heavy-duty cast aluminum grooming clamps are virtually indestructible. They feature easy-grip table clamp knobs (either one or two) and wide clamping surfaces that eliminates arm wobble and reduces the risk of table breakage. In addition, their easy-grip arm adjustment knob ensures hours of effortless use, while the clamps have more than adequate thread to eliminate stripping. The design of the arm race is such that with minimal effort on the adjustment knob the possibility of the arm dropping on the dog’s head is virtually eliminated. For use with 3/4" square grooming arms. Clamp opens to a maximum of 1.5"