Material: The wall expansion anchor is made of high quality and very flexible plastic, which is not easy to break. The self-tapping screws are made of high-strength stainless steel, which is resistant to oxidation and corrosion and can be used for a long time. Practical Design: The slot of the ribbed wall anchors adopts an expansion curve design, which expands on two opposite sides when you tighten the screw, which greatly increases the anchoring force and prevents the wall anchor from rotating in the hole. Easy to Use: Just drill a hole in the wall, then insert the wall anchor, and then tighten the screw clockwise to complete the installation. Widely Applicable: Our wall anchors and screw set are suitable for installing or hanging various items, such as frames, bathroom or kitchen accessories, shelves, lamps, murals, mirrors. Package Includes: 100x Screws; 100x Expansion Tubes. Note: The data are all manually measured, please allow 1-3cm error due to different light and display,