Tin Knocker's 9 Station Button Lock Rollformer means no hammering over of edges. The Button Lock roll former comes with "male" tooling on one side and "female" on the opposing side. A fast, effective way of marrying 20 to 26 gauge duct sections.
The Tin Knocker line of sheet metal working machinery was specifically developed to meet the needs of the small to medium sized HVAC contractor. The line is unique in that it is the only line which has all machines necessary to set up a complete HVAC sheet metal shop. Some machinery manufactures make roll formers, but not shears and brakes. Others make slitters or beaders, but not shears, brakes or roll formers.