Easy to use and install. Expansion occurs by tightening the bolt. The bolt pulls out a tapered cone, which is the expansion bolt fixed to the wall Made of high-quality non-carbon steel, can be used outdoors Model: M6 hook/M8 hook/M10 hook/M8 hook+spring Widely used in concrete and masonry construction, fences, anti-theft doors and windows, canopies, air-conditioning fixed, home decoration, engineering, rain shed; used for the fastening of steel ropes, chains and other materials on concrete, bricks and other materials. Designed for quick setup with standard tools, these expansion bolts provide a secure, vibration-resistant grip in concrete, brick, or masonry. Easy to use and install. Expansion occurs by tightening the bolt. The bolt pulls out a tapered cone, which is the expansion bolt fixed to the wall Made of high-quality non-carbon steel, can be used outdoors Model: M6 hook/M8 hook/M10 hook/M8 hook+spring Widely used in concrete and masonry construction, fences, anti-theft doors and windows, canopies, air-conditioning fixed, home decoration, engineering, rain shed; used for the fastening of steel ropes, chains and other materials on concrete, bricks and other materials.