1The kit includes: fixing plate + expansion nut*4 + screw*4 + M8 stainless steel buckle + M8 rotating ring + M7 spring. 2High-quality material: Made of high-quality stainless steel, it is sturdy and durable, waterproof and rust-proof. Can be used on beams, wood, trees, or boards. Stainless steel carabiners can be used to hang a hammock or swing. These materials all have good corrosion resistance and toughness. 3Super strong: Can support 450 kg. The springs relieve stress from the impact of work and extend the life of the mounting hardware. The swivel hook rotates 360 degrees to prevent tangling or twisting. 4Easy to use: You only need a screwdriver to install it. This kit allows you to relax and face no problems. 5You can screw the hook fixing plate into a beam or solid wood board. Works with all major types of hanging chairs, including swings, hammocks, hanging chairs, sandbags and more. Silver. The fixed plate size is approximately: 90*40mm. See the picture for size details.