This door hinge is made of heavy-duty stainless steel, we upgraded the blade thickness to 3mm to improve stronger load-bearing capacity, no deformation, rust-proof, corrosion-resistant and oxidation-resistant. 4 x 4 inches; Finish: Stainless Steel Brushed. 2 stainless steel hinges and 16 stainless steel screws. This exterior door hinge features non-removable pins (NRP) with long-lasting ground pins for enhanced security. Whether your door is left or right, this hinge will fit. They are heavy duty reversible hinges. This door hinge is specially manufactured with ball bearings. Unlike ordinary hinges, it reduces squeaks when you close or open the door, and has good stability. Specially lubricated pins and ball bearings make the door quieter and smoother when opening and closing. Ideal for commercial or high-strength doors. If you have any questions or concerns, you can contact us at any time and we will reply and solve your problem within 24 hours.