Workmanship Specification: Produced under ISO 9001 Quality Management System,conform to TUV-GS DIN 79000 standard. Materials:high quality steel and hot galvanized steel is optional. Main pipe thickness is 3.00mm,supporting part is 2.75mm. Sand blasting machine to clean the rust before coating. Powder coating:electrostatic coating, lacquer that bake treatment. first layer epoxy powder(50-80um),second layer plastic powder(90-140um). Welding technique:arc-welding,cabon-dioxide welding,mixed-gas welding. Stainless screws and nuts. Bearings are from NSK. ilding. Direction: Hanging up the round pipe with feet, crossing the hands behind head, making Body backward to the trainer then recover.