General description Made of high-quality 304 stainless steel, these heavy-duty U-shaped hooks are designed for durability and practicality. They are rust-proof, non-toxic, and environmentally friendly, ensuring a safe and long-lasting use. With superior hardness and strong load-bearing capacity, these hooks are perfect for various hanging applications. Technical specifications Material: 304 stainless steel Color: Silver Size: M5 Package Contents: 10 U Ceiling Knobs, 10 Spring Clasps, 40 Screws, 40 Anchors Measurement allowed error: +/- 1-3 cm Usage Install on the ceiling in areas requiring rotation without twisting chains or ropes. Suitable for hanging swings, chairs, hammocks, aerial silks, yoga swing suspensions, or other heavy objects.