metal folding spring anchor with hook mounted and screwed into a pre-drilled hole in a sheet of moisture-proof drywall

anchor background board buster ceiling chandelier construction crosssection custard cut dowel drill drilled drywall end example fasteners fiber fix fixed folding galvanized gypsum hanger hole hollow hook installing isolated lamp metal moistureproof mounted mounting nut panel petals plasterboard plate predrilled screwed section sheet spring stainless steel suspension thread view wall wallboard white wings