These 5/16-18 security locking nuts are manufactured from durable 304 stainless steel, designed to provide enhanced protection for various applications. The nuts feature an 18 TPI coarse thread (UNC) specification, ensuring compatibility with standard threading systems. The innovative design incorporates a smooth special camber surface that prevents unauthorized removal using conventional tools, requiring the included matching security key for installation and removal. This hardware kit is versatile and suitable for multiple applications including mountain bikes, vehicle accessories, awnings, light bars, support structures, and protective window nets. Each package contains four stainless steel lock nuts and one stainless steel security key tool, providing a complete anti-theft solution. The black finish offers both aesthetic appeal and corrosion resistance. Please note that mounting bolts are not included in this kit and must be purchased separately.