Wall light steel keel, Specification: 1) Vertical steel keel a) QC73.5*45*0.6, 0.7, 0.8 b) QC98.5*45*0.6, 0.7, 0.8 2) Transverse steel keel a) QU75*35*0.6, 0.7, 0.8 b) QU100*40*0.6, 0.7, 0.8 Ceiling light steel keel, Specification: 1) supporting steel keel a) DU38.5*12*1.0, 1.2 b) DU50*14*1.0, 1.2 c) U60*27*1.0, 1.2 2) Covering steel keel a) DC50*19*0.4, 0.5