The door loop is a low cost method of transferring low voltage power from the door frame to the locking device. Door loops are commonly used with electric mortise & cylindrical locks, electric exit trims and latch pullback devices.Configurations: DL-24AL - Standard 24" length with aluminum finish DL-24D - Standard 24" length with duronatic finishFeatures: Durable powder coated finish Pre-drilled holes in base Flexible armored conduit No hassle 3-Year Warranty