Specification: 1) Size range: 5-114mm OD x 0.5-15mm WT 2) Heat treatment: annealed, bright annealed, stress relieved， normalized, spheroid annealed, or cold finished. 3) Standards: ASTM/ASME, SAE, AMS, JIS, BS, DIN, GB 4) Rust prevention treatment, oiled 5) Plastic plugs in both ends 6) Hexagonal bundles of max. 2,000kg with several steel strips 7) Smooth surface, uniform mechanical property, and tight tolerance