The 50" Calibrated Column is a wide and vibration-resistant column of aluminium tubing with dull-black anodized surface and cm and inch scales. With mount and fastening device for copy arms. Height adjustment by hand crank. Cross section of column: 2.8 x 1.4" (70 x 35 mm). Counter balanced with rack and pinion. Looking screw for fixing height position. Height: 50" (1.2 m)