Universal stud bushing. Pass one end through the hole in the stud. Snap the bushing and washer ends together. Separation of the two halves is not required. If a punched hole is required, the bushing can be installed in a standard 1-inch trade size, round punched hole (1-3/8-inch). Snap the bushing end into the hole. Meets requirements of NEC Article 300-4(b). UL listed.