This is a full mortise ball bearing hinge built to carry electrical wiring through the hinge knuckle. It mounts between the door and frame at openings with electrified hardware such as electric locks and strikes. The steel hinge is standard weight with a 5 knuckle design. Part BB1279 4-1/2X4 L1 ETW8 is the Standard Weight, 4-1/2 x 4 in, Steel, 5 Knuckle, 8-Wires version in Flat Black.

• Standard Weight
• 4-1/2 x 4 in
• Steel
• 5 Knuckle
• 8-Wires
• Finish 693 Flat Black
• Fire rated: 3 Hours {A}
• Part number BB1279 4-1/2X4 L1 ETW8