... .OD:9mm-200mm 3.length:3m or as your requirements high quality stainless steel pipes StandardASTM,AISI,GB,BS,JIS,EN,DISOuter ... not oxidize or turn black. Some firearms incorporate stainless steel components as an alternative to blued or parkerized steel. Some handgun ... . We have more than 3 years of experiences in producing high quality stainless steel products, such as: 201, 301, 304, 321, 316 ...