High quality material: Made of 304 Stainless Steel, which is much more durable and anti-rust. Fit for any extremely weather condition. Ball bearing door hinges: 2BB full mortise hinge, keep the door more smoothly and silent. Product Dimensions: 3.5 inches X 3.5 inches door hinges,0.1inches thickness with square corners. Package Contents: Come with 3pack hinges and adapted screws, Easy to install and can be used for both exterior and interior doors. Notes: The hinges pin is fixed and non-removable, please be noted! 304 Stainless Steel Door Hinges 3.5Inch