Seamless Mechanical Tubes Seamless Mechanical TubesFeatures:1) NB: 1/2" - 12"2) WT: 0.5" - 19.68"3) Steel Grade: Gr.1010, Gr.1020, Gr.1026, Gr.1035, Gr.1045, Gr.4130, STKM16A, 17A, 18A4) Standards: ASTM A512, 513, 519, JIS G3445, DIN2391, 2393, 2394Outer packing: In bundles or seaworthy wooden cases Seamless Mechanical Tubes