[Deep thread design]:The dry wall expansion anchor,screws for hollow doors is made of high-quality zinc alloy material,rust-proof and corrosion-resistant.It has high hardness,is not easy to deform,durable,safe and reusable.The deep thread design provides strong joints and can be locked Various sizes of drywall for maximum retention. [Easy installation]:Insert the fixing point into the gypsum board until the thread of the self-drilling plug engages with the board,keep the pressure on the wall plug fixing piece and screw into the gypsum board until the fixing piece is flush with the gypsum board.Place the screws In place and tighten until you are sure that the screws are firmly secured. [No need for pre-drilling]:There is no need to find the size of the drill bit for the pre-drilling during installation,just drill holes in the plasterboard and tighten the screws.Only use an electric or manual screwdriver and the provided screws.It is more self-contained Drilling drywall anchors is easier to get started. [Gypsum board fixings]:Metal self-drilling wall plugs are suitable for gypsum board walls and dry-lined walls.Typical gypsum board fixing devices are suitable for fixing devices for shelves, bathroom equipment, brackets and hooks, and also suitable for picture hanging, cables Trunking, sanitary equipment, sockets, lighting, electrical accessories, handrails, shelves, mirrors, wood and metal strip installation, etc. [50 sets of metal gypsum board fixing]: The package contains 50 gypsum board expansion screws 14*28 single point. With 50 self-tapping screws: M4*35mm. The quantity can meet your daily use. Suitable for experienced and inexperienced Users, these fixtures are very suitable for professional and domestic use. Short length. Very suitable for dry painted walls. Single or double layer gypsum board. Quantity: 50 sets Expansion plug:14 * 28 single tip Screw:M4 * 35mm Weight:400 g Package Include :50 * Self-drilling metal anchor for plasterboard 50 * Screws for drywall