Specification: Item Type: Self Drilling Anchors Screws Material: Carbon Steel Application: For Shelf, Cabinet, Decorative Curtain Fixing, Calligraphy Hanging, Wall Cabinets Weight: Approx.133g/4.7oz Package List:40 x Expansion Tube40 x Screw Features Carbon Steel Material:: The self-drilling anchor screws are made of carbon steel material, which has high durability. When you tighten the screw, the anchor can expand on two opposite sides, thereby increasing the fixing force. Screw-in design:: The self-drilling drywall anchor screws and anchor bolts are more fully expanded, and the screw-in design is more reasonable, making it convenient for users to fix decorations. Leave No Holes:: The expansion anchor can easily remove screws and items, leaving the anchor on the wall for reuse, and leaving no holes on the wall after use. Scope of application:: Metal drywall anchors are suitable for shelves, cabinets, decorative curtain fixing, calligraphy and painting hanging, wall cabinets, photo frames, and other home decorations. Package Contents:: The Package only contains 40 screws and 40 expansion anchors. Other accessories and tools need to be prepared by yourself.