National Hardware's 1-1/2,1-3/4,3" Black Universal Knob Latch is designed for wood or metal screen and storm doors with either 1-1/2, 1-3/4, or 3 inch hole spacing. Manufactured from zinc die-cast for durability. Mounting screws included for easy installation. For interior and exterior applications Fits wood doors from 5/8" to 1-3/8” thick Includes spring loaded strike plate