... of contamination 4. in accordance with CE, ISO9001 and ISO14001 Double Air Walker1. Material : Plastic wood and A3-typed carbon (Q235 ... : 32*3mm(diameter is 32mm and thickness is 3mm) 2.Process Flows:Cutting, surface processing, tube processing, welding, polishing, sand blasting ... less than 30 minutes and not more than 1 hour. Double Air Walker