Product Description: Specifications: M4*90 Material: Metal (Surface Treatment: Galvanized) Wall Hole Diameter: 10mm to 12mm Screw Head Type: Hook Screw Screw Length (including hook): 90mm Screw Specification: M4x90 Material: Carbon Steel Color: Silver Package Includes: 12 Roof Hooks 【Premium Carbon Steel Material】: This roof hook is made of galvanized steel, making it stronger, more durable, and more corrosion-resistant than ordinary steel hooks. It ensures a long service life in any lighting installation and is fully reusable. 【Swing Wing Design】: It automatically opens and is supported by spring force under any circumstances. 21mm round washers and fixing screws provide safer protection for your installation. The wing can span a larger area and is compatible with hook installation on hollow walls. The swing wing can distribute the load over a larger area. 【Extra-High Load Capacity】: This hook has been professionally tested and can bear a load of up to 10 kg, enough to support the weight of most lighting fixtures. Its integrated design makes its structure more stable, and the wing lever can distribute the load over a larger area, preventing it from falling off even after long-term use. [Space-Saving, Organized Storage]: Saves space and keeps your room tidy, ensuring your home is clean and organized. Install a hook to store items; even cluttered items can be hung where the hook is installed, making your life more organized and tidy. [Versatile Use]: This sturdy hook is perfect for hanging plants, wind chimes, lamps, curtains, bedspreads, and other decorative and lightweight items. It can also be used to mount light fixtures, curtain rods, electrical conduits, clothes hangers, etc., suitable for hanging lightweight items. Compatible substrates include drywall, partitions, hollow bricks, and wood panels.