This is a full mortise ball bearing hinge for swinging commercial doors. It mounts in a mortise cut on both the door and the frame. The ball bearings between the knuckles help the door swing smoothly. Part BB1191N 4-1/2X4-1/2 US26 is the Standard Weight, 4-1/2 x 4-1/2 in, Brass, 5 Knuckle version in Bright Chrome.

• Standard Weight
• 4-1/2 x 4-1/2 in
• Brass
• 5 Knuckle
• Finish US26 Bright Chrome
• Fire rated: 3 Hours {A}
• Part number BB1191N 4-1/2X4-1/2 US26