... we are a manufacturer for steel tubing NAME Q195 dark black cold rolled steel tubing WALL THICKNESS0.3-2.0mmTECHNOLOGY ... Cold rolled black annealed steel tubing SHAPErectangular SIZES8*16mm,8*18mm,9*19mm,10*20mm, ... , 22*26mm,25*30mm,30*50mm,40*60mm,40*75mm,40*80mm50*100mmLENGTH3-12m TOLERANCE Wall thickness tolerance :+/-0. ... , L/C Q195 dark black cold rolled steel tubing