Stainless Steel 304 / 316 C Channel Strut Our stainless steel C channel (strut channel) is roll formed from 304 or 316 stainless strip and supplied in 41x41mm, 41x21mm and 41x61mm profiles with plain or slotted back. 304 grade covers general indoor and outdoor supporting systems, while 316 grade with 2-3% molybdenum is specified for coastal, marine and chemical environments where chloride attack is constant. Standard stock lengths are 1m to 6m, and any cut length, hole