... ASTM A 554 and others.Features:1) Material of stainless steel: grade: AISI 201, 304 4302) Applied field: construction upholstery, and ... ,76,88.9,102,114,133,141,159,219 2)Square pipes - Outside dimensions(mm) : 10x10,12x12,15x15,17x17,18x18,19x19 ... manufactured according to customers' requirements AISI 201 304 430 stainless steel series round/ square /Rectangular tube/pipes