National Hardware's 3" x 2-1/2" Black Screen/Storm Door Hinges are designed for use on light screen doors. Manufactured from cold-rolled steel for durability. Surface mount - no mortising required For interior and exterior applications Coated with Weatherguard Protection to withstand harsh weather conditions and prevent corrosion. Surface mounted, so no mortise/cutout required Pin taps out for door removal, which allows extra space for items to pass through door ways when needed Holes are countersunk on both sides allowing screw heads to sit flush with hinges Safe working load = 45-Pound per hinge