CONCRETE FIXING PRODUCTS AND JOINING PIECES MADE OF STEEL, NAMELY, FASTENING PLATES, BOLTS, COLUMN SHOES, CORBELS, HANGARS, TIES, JOINT REINFORCERS, LIFTING JUGS, LIFTING ANCHORS, LONG DOUBLE BARS USED FOR LIFTING COLUMNS, BALCONY JOINTS, EXPANSION JOINTS; [ WOOD CLAMPS, NAMELY, NAILS, SCREWS, NAIL PLATES; ] LOAD-BEARING STEEL BEAMS AND COLUMNS