Product Description: Specifications: M4*90 Product material: metal (surface treatment: galvanized) Wall hole punch diameter: 10 mm to 12 mm Screw head type: hook screw Screw length (with hook): 9OMM Screw specification: M4x90 Material:Carbon Steel Color: Silver Package includes 12x ceiling hook High quality carbon steel material: This ceiling hook is made of galvanized steel, which is stronger, more durable and more corrosion resistant than ordinary steel hooks. It can ensure a long service life in any light fixture installation work and is fully reusable. Rocking wing design: Under any circumstances, it can automatically open and support by its spring force. 21mm round gaskets and fixable screws provide more secure protection for your installation. The switch wings can span a wider area and are suitable for mounting hooks on hollow walls. The swinging wings can spread the load over a larger area. Large load-bearing capacity: This ceiling hook has been professionally tested and the load-bearing capacity is 10 kg, which can support the weight of most lamps. The comprehensive design makes its structure more stable, and the switch wings can distribute the load over a wider area. For a long time, the object will not fall. Save space and hold well: Save space, keep the room tidy and keep household items clean. A hook is installed for your storage space, and even messy items can be hung where you install the hook. Make your life more tidy and tidy. Widely Application: The sturdy ceiling hook is very suitable for hanging plants, wind chimes, lamps, curtains, bedspreads and other items. other decorations and light items. It is also used to fix lamps, curtain trunking, cable groove, coat rack, etc., suitable for fixing light loads. Suitable substrates are gypsum cardboard, room dividers, hollow bricks and wooden planks.