We supply lock forming machine(Pittsburgh lock machine, lock former, lock rollformer), spiral tube forming machine (spiral tube former), angle steel bending machine (round flange forming machine), shearing machine (cutting machine), flange forming machine, beading machine, hand folder (hand folding machine), elbow making machine (elbow maker), universal hand (bending grooving machine), duct manufacture auto-line, flange folding machine (flange foler), plate rolling machine (plate bending machine), which are all used in duct fabrication.