40 Pieces Q-Hanger Hooks:hooks were built in strong Metal with rust proof coating to prevent your goods down off.Expansion screw of the end,safety design Q-hanger hook for holiday string lights, will not fall out, which increases the safety performance of the product.Size:the diameter of the metal screw is about 3.8mm/0.15 inch,the diameter of the Non-slip hook is about 18mm/0.7 inch and the length of the Lights Hanger Hooks is approx.60mm/2.4 inch.Each Ceiling Hooks with Safety Buckle are 8.28g, suit for indoor and outdoor use.Easy to Use:You can screw the hooks into the wood with a wrench, or drilling the hooks into the cement wall.suitable for all solid surface such as walls, ceiling, bricks, wooden beams, outdoor eaves, garden and more.Use Application:It is widely used in bathroom, outdoor ,kitchen, decorations including ceiling hooks, coat hooks, key hooks, plant hook, bath towel hook, picture hooks. Nice as a Christmas Light Hook Screw in Hooks for Plant Bracket, Bird Feeders, Wind Chimes, Lanterns, Wire, wreath and Decoration Hanging.Colour:blackMaterial:MetalPackage Contents:20 x straight hook20 x hookOnly the above package content, other products are not included.Note: Light shooting 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.