... )Cover mouth forms: conical suction mouth (A), Horseshoe suction mouth (L), plate suction mouth(T), hat-type suction mouth (H)other forms of ... material: the spring steel is galvanized, and other metal components and fasteners are all stainless steel 304#.External tube use ... strength, with power device, easy to operate, hover freely. Suction arm is widely used in metal processing,welding fume,workpiece ...