iron nickel plating material, durable to use. Spring loaded with excellent tension and pull up ability. High strength catch and strike. With compact size and easy to use. It is really a great tool for home, office, shop and so on. Specification:Material: IronFinish: Nickel PlatingTotal Size: 72 x 22 x 9mm / 2.83" x 0.87" x 0.35" (L*W*H)Main Body Size: 58 x 23mm / 2.28" x 0.91" (L*W)Arm Length: 24mm / 0.94"Hook Size: 27 x 20 x 7mm / 1.06" x 0.79" x 0.28" (L*W*H)Hook Thickness: 1mm / 0.04"Hook Mount Hole Diameter: 4.1mm / 0.16"Body Mount Hole Diameter: 4.1mm / 0.16"Lock Hole Diameter: 4.5mm / 0.18" Package Content: 2 x Spring Toggle Latch