sheet metal frame: 1. Material: C.R.S. 2. Surface ... in lots of high-quality metal enclosures, such as distribution box, control box, aluminum box, electric cabinet, network ... Europe, Australia and Janpan, etc. Comments on sheet metal frame: 1. Material: C.R.S.2. Surface treatment: ... in lots of high-quality metal enclosures, such as distribution box, control box, aluminum box, electric cabinet, network ...