Seamless Steel Pipe Material: This extension tube is made of high quality Alloy Precision Steel with a chrome finish and is durable, durable and rust free. corrosion resistance and oxidation resistance. aluminum tubes Seamless Construction: The interior is smooth with no seam and is available in an extruded structural or a drawn seamless aluminum round tube for precision applications. The aluminum tubing can be polished. Alloy Precision Steel Tubes Size: Outer diameter of explosion-proof pipe 16mm; tolerence:±0.05mm Round Tube Great for: Commonly used in DIY projects, hobby, crafts, building model, home decoration, frames, industry, gardening products and more. round tube hollow Package Include: 1pcs×Seamless Steel Pipe