3inch Stainless Steel Door Gate Hinge Fittings Double Action Spring Hinge Features: Made of stainless steel material in silver tone, screw fixing type is easy to install.  Exquisite craft with double door function, not easy to rust, long service life. Bearings with adjusted intensity, for a variety of materials swing door.  With rolling bearing built-in, increase the effectiveness of quiet. Widely used for free gate, bar counter doors, etc.  Specification: Material: Stainless steel Color: Silver Model A B C D E F G (Suitable door thickness) Reserved Gap Single Bearing Weight 3inch 92mm 78mm 62mm 12mm 25mm 16mm 20~30mm 10 7.5KG 474g/16.7oz 4inch 119mm 104mm 72mm 17mm 28mm 20mm 25~38mm 12 10KG 852g/30.1oz 5inch 145mm 127mm 81mm 20mm 32mm 22mm 25~42mm 12 15KG 1244g/43.9oz Package List: 2 x Hinge 2 x Positioning Nails  16 x Mounting Screw 1 x Regulating Rod