- These cramps are Australian Made and are primarily designed for the cramping of large section work pieces for joint gluing and general applications. Used by carpenters, builders and cabinet makers. The jaws and nuts are made from ductile iron and the Acme threaded screw and handle are high quality corrosion resistant steel. The sliding jaw is fastened to T-bar by inserting a steel pin through one of the locating holes along the bar.The T-bar sections are specially heat-treated Aluminium for strength and will resist twisting and distortion. The fixed jaw comes with a drilled feet for fi xing to a work bench. The heavy section cramp is more robust and is suitable for heavy-duty work.