Ives 5 Knuckle Ball Bearing Full Mortise Hinge 4-1/2 x 4-1/2 Concealed Electric Through-Wire 4, Architectural Control Systems, Mfr#: 5BB1-4.5X4.5-10B-1104

ARCHITECTURAL CONTROL SYSTEMS 5BB1 Series Hinges. Ives 5 Knuckle Ball Bearing Full Mortise Hinge 4-1/2 x 4-1/2 Concealed Electric Through-Wire 4 wire – 28ga, 10B Oil Rubbed Dark Bronze Finish