20 Pcs Screw Hook Material: Manufactured from nickel plated steel metal material, Long thread screw for extra holding power, can hold up to over 200lbs. . Screw Hook Size: Self-Tapping Screws overall length 3.5 inch, eye outside diameter 1.3 inch, eye inside diameter 1 inch, screw thread length 1.2 inch, thread diameter 4.2 mm. . Ceiling Hook Screw: Thick wire hooks Perfect for hanging objects from walls, Sharp screw points can easily screw the eye hooks into wood, plywood, drywall, cement mall and other surfaces etc, use plastic anchors for stronger installation. . Widely Used: Perfect to attach cables, chains and ropes to the wall and wood suraces. Good for hanging patio lights, lanterns, keys, baskets, wind chimes, garden tools and other small items, Also can be Used to Hang Stuffs in Porch, Hanging Plant in Garden.