Telescopic Pipe Key Specifications/Special Feature:1) Dimensions: OD. 19 - 22mm; 22-25mm x Thickness.0.35 - 0.8mm2) Custom specifications available3) Steel grades: 316/316L,304/304L,301, 202, 201,430, 409/410 304# compound pipe, 201# compound pipe, 202# compound pipe4)Standards: a) Domestic: GB/T b) Foreign: ASTM, AWS, ASME, BS, DIN, CAS, KR, NK, LR, AB, JIS Tel: 0086-579-760-1778 Fax: 0086-579-760-1718 Email: