... :carbon steel 3.standard: ANSI 4.manufacture & trading stainless steel end cap sizeseamless 1/2" to 24" seam weldding 4" to 48 ... 2615, DIN2616, DIN2617;GOST 17375; GOST 17378; JIS2311 Wall thickness2MM----25MM SCH5,SCH10S, SCH10, SCH20, SCH30, STD, SCH40, XS, SCH60, SCH80 ... FEEL FREE TO CONTACT ME AT ANY TIME. stainless steel end cap