ACL LC-12 and LC-15 series Pittsburgh lock machines are the most widely used machines in manufacturing ducts. They boast a variety of distinctive features to meet buyer’s requirement by replacing rolls. They are light and easy to move. They are suitable for being used on site. LC-12 can process sheet metal of 0.5-1.2mm thickness. LC-15 can process sheet metal of 0.7-1.5 thickness.