Spiral clamp | The four-screw clamp manufactured by Dizil cast iron is a leading cast iron company in the weights of 1,300 grams to 1,650 grams in woodworking and steel brands and Iran clamps. The four-screw clamp has 2 sheets and 1 cutter. These parts are assembled by 4 screws, 4 screws and 4 gaskets. The steps of the production of quadruple clutches include: casting of sheets and parts, crushing and disassembly, machining of parts, shoting of parts, quality control of parts and polishing, assembly, quality control of assembled product, packaging. The two edges of the pipe are cross-sectional and 90 ° applied to all working surfaces