Threaded Rod - 1/4-20 Male Coupler with 3/4" Self Drill Screw (16-22 Gauge, Sheet Metal Applications). Hang ceiling wire & jack chain, threaded rod and eye lag screws. Our hardware is designed for the most efficient, secure and cost effective solution. High quality all steel construction. Threaded and non-threaded holes to accommodate jack chain, ceiling wire or threaded rod.