... c)Act as a barrier to noise steel security doorfeatures:1) Material: cold-rolled steel2) Frame outer size (H x W ... ):a) 2,050 x 860mmb) 1,970 x 860mmc) 2,050 x 900mmd) 1,970 x 900mme) 2,050 x 960mmf ... ) 1,970 x 960mm3) Door panel thickness: 50mm ... , HuangQi Town , Nanhai District ,Foshan City, China Steel security door(027)