Product Description Overview:The Command Access ETH4W5K4545 625 CH-BB79 Energy Transfer Hinge is a 4-wire, 5-knuckle, standard weight hinge designed to route 26-gauge low-voltage power from the door frame to locking hardware without any visible wires. This hinge is ideal for professional installations requiring both reliability and a polished appearance. Specifications: SKU: ETH4W5K4545 625 CH-BB79 Size: 4.5″ x 4.5″ Finish: Bright Chromium (625) Weight: Standard weight hinge Design: 5-knuckle, full mortise Wire: 4-wire, 26-gauge conductors for low-voltage transfer Application: Interior or exterior commercial doors Hinge Type: Energy Transfer Hinge (ETH) Typical Uses: Electric mortise & cylindrical locks Electric strikes (especially on paired doors) Electrified exit trims & latch pullback devices Door-mounted card readers Low-voltage door lighting Features & Benefits: Conceals wiring inside hinge for security and clean aesthetics Transfers power without restricting door movement Supports a wide range of electrified door hardware and access control systems Bright Chromium finish for a modern, durable appearance Designed for long-lasting commercial use