DIYers and professionals, these expansion hooks are seriously heavy-duty solutions for hanging things on concrete, brick, or stone surfaces! You get 2 hooks in the package, both made from quality 304 stainless steel that's rust-proof and corrosion-resistant - perfect for both indoor and outdoor use. The M10 size is substantial with a total length of 4.4 inches and a tube diameter of 1.7 inches, giving them impressive holding power for heavier items. Installation is straightforward: drill an appropriate-sized hole, remove the washers and nuts, insert the hook, then reassemble and tighten until the sleeve expands securely against the hole walls. The expansion mechanism creates an incredibly strong grip that can handle significant weight without pulling out. They're perfect for hanging fences, awnings, air conditioners, security cameras, heavy mirrors, or any item that needs secure mounting on masonry surfaces. The silver finish looks clean and professional, and the 304 stainless steel means they'll maintain their appearance and strength even in harsh weather conditions. The quality is industrial-grade - these aren't those cheap plastic anchors that strip easily or weak metal hooks that bend under pressure. Whether you're working on home improvement projects, security installations, or commercial applications, having reliable expansion hooks like these makes the job so much safer and more professional. The included installation instructions are clear, but always remember to wear safety glasses when drilling into concrete or masonry. For anyone needing secure hanging solutions on tough surfaces, these M10 expansion hooks deliver the reliability and strength you need for peace of mind.