Include：12-Pack Black non-mortise door hinges size is 4" x 3" , thickness: 2.5mm, Door Hinges antirust treated surface ensures excellent anticorrosion, firmness and durability. Material: 304 stainless steel, made of rugged stainless steel, made of precision, high strength, not easy to rust. Mute: under the action of lubricated ball bearing, no noise will be produced when opening or closing the door. Adopt high hardness 304 stainless steel, more firm installation and use, not easy to rust and deform for a long time., Manufacturer: Shun Yingtong