SAFETY BUCKLE DESIGN: These square-shaped ceiling hooks are perfect for hanging string lights, plant baskets, wind chimes, and holiday decorations. Each hook comes with a safety buckle to prevent hanging items from falling down, even in strong winds. CONSTRUCTION: This heavy duty hook measures 2.36'' (6cm) and feature a metal construction with black coating finish to resist rust and withstand outdoor weather conditions. It can hold up to 40lbs and has a square-shaped design to provides excellent stability and support. EASY INSTALLATION: These string light hooks are very easy to intall. You can screw the hooks into the wooden wall directly by hand or wrench. If you want to install it on a concrete wall, you should drill a 0.24''(6mm) hole first, then plug the expansion tube into the hole, and then use a wrench to screw in the hook. MULTIPLE USE: These multi-purpose hangers are ideal for creating magical holiday displays, hanging , or setting up ambient lighting in your patio, garden, or indoor spaces. The black finish blends seamlessly with most decor styles while offering weather resistance for long-lasting use. For both indoor and outdoor use, it can help to handle most your hanging needs easily. WHAT YOU GET: Package include 20 screw hooks, 20 plastic tubes and 1 wing nut driver. Color: As shown Material: Metal Package Contents: 20 * screw hooks, 20 * plastic tubes 1 * wing nut driver Only the above package content, other products are not included. Note: Light reflection and different displays may cause the color of the item in the picture a little different from the real thing. The measurement allowed error is +/- 1-3cm.