grey plastic butterfly-type dowel fixed in sheet of moisture-resistant drywall, view in section of end of sheet.

anchor assembly attached board buster butterfly butterflytype closeup connection construction custard cut design details dowel drilled drilling drywall fastener fiber fixed fixing gray grey gypsum hole hollow house industrial installation interior iron metal moistureresistant mounting open panel plasterboard plastic polyethylene polypropylene predrilled reliable resistant room screw screwing sheet showing site spacer split twist view wall wallboard