metal molly fastener fixed in a pre-drilled hole in sheet of drywall. split view, showing gypsum fiber and connection

anchor assembly attached board bolt collet connection construction cut detail details diameter dowel drilled drilling dropdown drywall fastener fasteners fiber fixed fixing gypsum head hole hollow industrial install installation iron length metal metallic moistureresistant molly moly mounting open plaster predrilled reliable reliably screw screwing sheet showing site spacer split steel strong twist view wall