RSG DHE3PC Door Holder 3? Extension Rod, Chrome FinishThe RSG Security DH series fire door holders are constructed of the finest materials and workmanship available. The door holder is made of durable die cast metal and offered in a high luster powdercoat finish. Other features include standard dual voltage ac or dc inputs of 12 & 24V, 24 & 120V, and 24 & 220V models. While reducing stocking requirements, model 24120 draws a mere . 020 ma. @ 24VDC, lowering overall job costs. In large installations the