Speedball Deluxe Hinge Clamps are fabricated from a heavy-duty zinc alloy. Allows quick changing of printing frames, yet holds frames securely. They feature a wide-wing thumbscrew for firmly fastening the clamp to the frame. These clamps also feature positive locking for perfect registration and precise control. Registration is the lining up of the print in the same place on each print. Measures 3 inches in height. Base 2 x 2.5”.