... window, guard door etc. 2. Material: 201, 202, 304, 316, 430 Stainless steel square tube, box section, hollow section Diameter: 10*10mm~150 ... and 400grit Grade: 201, 202, 304, 316, 316L, 321, 409, 430 Standard: GB/T12770; ASTM A554; JIS G3446; DIN EN10296-2 ...