Material - This industrial hook is made of iron metal, galvanized on the surface, and the screws are made of stainless steel. Load capacity - The circular bottom plate has a larger and more uniform force surface; the lamp hook can withstand up to approximately 100 kg. Application - The hook can be used for hanging ceiling fans, mosquito nets, lanterns, ceiling lights, plants, cages, baskets, pendant lights, chandeliers, crystal lamps, light fixtures, and more. Material: Metal (Screw: stainless steel). Dimension: Bottom plate diameter: 90mm. Height: 35mm. Package: 2 x Ro Base Ceiling Plate Kits. Installation Steps: 1. Before installing the ceiling hook, determine the installation hole. It is better to select one of the holes in the right direction of the hook head, and then select two other holes to form a solid triangle. 2. Place the hook in the desired hanging position and mark the position of the mounting hole on the ceiling. 3. Drill the hole according to the marked position, then insert the expansion plug into the hole. 4. Align the holes in the bottom plate with the holes in the ceiling, then tighten the screws. Note: 1. The dimension data above is manually measured. Please allow 1-3mm error. 2. The installation procedure of the hook is very simple, but we recommend that you have it installed by a professional.