1. stainless steel welded tube for stair rail,safety window, guard door etc. 2. Material: 201, 304, 316, 430, etc ... GA sizes are availableSurface available: MF, 180grit, 240grit, 320grit, 400grit and 600gritGrade: 201, 202, 304, 316, 316L, 321, 409, 430Standard ... fitness equipment, electroplating, dyeing, trains, cars, bicycles, furniture and other decoration.Advantage: Quite smooth welding line ...