6 CONSTRUCTION ELEMENTS MADE FROM COMMON METALS, NAMELY, SUPPORTS, FITTINGS, FASTENING AND CONNECTING ELEMENTS FOR MOUNTING PIPES, RADIATORS, SANITARY OBJECTS, AIR CONDITIONING AND ELECTRICAL INSTALLATIONS, CABLES AND IDENTIFICATION PLATES AS WELL AS FOR THE CONSTRUCTION OF FACADES AND THE DRY CONSTRUCTION OF FLOORS, CEILINGS AND WALLS, NAMELY, SCREWS, BOLTS, DOWELS, NUTS, WASHERS, THREADED PINS, BUSHINGS AND PIPES, TURNBUCKLES, CLAMPS, BANDS, BRACKETS, MOUNTING ANGLES, RAILS, PLUGS, ANCHORS AND HANGERS; FORMED AND MOLDED CONSTRUCTION PARTS, NAMELY SOCKETS AND METAL HOUSINGS OF SOUND AND VIBRATION DAMPENING BEARINGS AND SUPPORTS; METAL CLAMPS, NAMELY, PIPE CLAMPS, SPRINKLER CLAMPS, BAND CLAMPS, SUSPENSION CLAMPS, HOSE CLAMPS, CABLE CLAMPS, HOLDING CLAMPS FOR INSTALLATION RAILS, AND CLAMP RINGS; METAL FIXED BEARINGS, METAL SLIDE BEARINGS AND METAL ROLLER BEARINGS FOR PIPES; STEEL BANDS, METAL TENSIONING MEMBERS FOR STEEL BANDS, NAMELY, TURNBUCKLES, TENSIONING SCREWS AND TENSIONING HEADS WITH A WORM THREAD ENGAGING A TOOTHED RACK FORMED IN THE STEEL BANDS; METAL PERFORATED MOUNTING STRAPS; METAL PERFORATED MOUNTING HANGERS; METAL INSTALLATION RAILS; METAL MOUNTING RAILS; METAL ANGLE RAILS; METAL RAIL JOINTS; METAL RAIL SUPPORTS; METAL ANGLE BRACKETS; METAL SHACKLES AND LUGS WITH RUNNING ROLLS; METAL RADIATOR SUPPORTS; METAL RADIATOR HOLDERS; METAL FASTENING ANGLES FOR RADIATORS; METAL RADIATOR ANCHORS; METAL AIR DUCT BRACKETS; METAL AIR DUCT JOINTS; METAL IDENTIFICATION PLATES; METAL IDENTIFICATION PLATE HOLDERS; METAL HANGERS FOR MOUNTING RAILS; METAL MOUNTING ANGLES; METAL PENDULUM SUSPENSIONS; METAL THREADED REDUCING SOCKETS; METAL LOCKS, NAMELY, TENSIONING LOCKS WITH RIGHT HAND AND LEFT HAND THREAD; METAL SCREWS; METAL SCREW BOLTS; METAL NUTS; METAL FASTENING ANCHORS; METAL NAILS; METAL WASHERS; METAL RIVETS; METAL SPRINGS; METAL EYELETS; GOODS MADE OF SHEET METAL, NAMELY BASE PLATES FOR NAME PLATES, SHELLS, PERFORATED STRIPS, PIPE CLAMPS AND LIGHT BRACKETS; METAL PIPES; METAL OPEN AND CLOSED CABLE DUCTS; METAL BOXES