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ANSI A156.1 Grade 1 Certified Heavy Duty 4 Ball Bearing Door Hinge/Fire Proof High Quality Industrial SS304 Door Butt Hinge with Grease, Find Details and Price about Full Mortise 5 Knuckles Door Hinge 2 Ball Bearing 4.5 Inch Hardware from ANSI A156.1 Grade 1 Certified Heavy Duty 4 Ball Bearing Door Hinge/Fire Proof High Quality Industrial SS304 Door Butt Hinge with Grease - Guangzhou Lockvel Security Technologies Co., Ltd.