TUNA IC ve DIS TICARET LTD STI is marketing -Pipe and profile lines-Pipe and profile forming rolls --Cut-to-lenght lines -Slitting lines-Slitting knives and spacers Open profile lines -Trapeze machines -high frequency welding machines -Leveller -Rotary shears -Multiple cutting units -profiles in various dimensions -coil steel-sheet steelLeading its sector company, also materialize the machine designing and manufacturing due to customer's requests.