The wooden keel for the ceiling is made of wood of about the same size.
Light steel keel is made of iron sheet, it includes: main keel, sub keel, hanging bar, big hanging (big hanging), in hanging (ha...
Light steel keel gypsum board is made of gypsum board and light steel keel joint into a suspended ceiling material. Gypsum board is with plaster of Paris as the main raw material, mixed with additives...
