These M6 security locking nuts are manufactured from 304 stainless steel, designed to fit bolts with a P1.0 pitch specification. The nuts feature a unique smooth special camber design that prevents removal with standard tools, requiring the included matching security key for installation and removal. This hardware kit is versatile and suitable for various 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. The specialized design provides enhanced security for your equipment and accessories. Please note that mounting bolts are not included in this kit and must be purchased separately.