MS round bars of 32.00, 36.00 and 38.00 mm are used to fabricate adjustable base jack with 4 TPI acme square threads. The base plate is fabricated out of 150 x 150 x 6 or 5 mm MS flat and malleable cast iron cup type light double handle duty nut. Sizes available are 350, 450, 550 and 600 mm of bar length.