312 Stainless Steel Flat Bar 1. grade:200 , 300 , 400 series ... . size: 3mm - 12mm x 25mm - 120mm 3. ISO , BV , GSG 312 Stainless Steel Flat Bar 1. grade: 201 , 202 , 301 , 302 ... , 303 , 303Cu , 304 , 304L , 309 , 310 , 310S , 312 , 316 , 316L , 321 , 410 , 420 , etc .2. size: 3mm - 12mm ...