... ,GB,TP 4.Application:decoration and construction etc Stainless Pipes Inox 304 ASTM A554 Features:1.Material:AISI3042.Certificate:ISO9001:20003 ... ,20,22,21,25,28,31.8,36,38,48,50.8,60,63,76,89,101.6,114,133b)Square ... ,30*30,36*36,38*38,40*40,35*35,50*50 c)Rectangular:20*10,23*11,24*12,25*13 ... ,30*20,40*20,34*22,36*23,38*25,50*25,60*30, 75*45,80*40,95*45 ToleranceOD ...