National Hardware® N178-814 Aluminum Universal Knob LatchFor wood or metal screen & storm doors with either 1 1 2", 1 3 4", or 3" hole spacing. For doors from 1 3 8" to 2" thick. Mounting screws included to match product finish. Interior locking mechanism provides for enhanced security. Includes spring loaded strike plate. Manufactured from zinc die cast. For wood or metal screen & storm doors with either 1 1 2", 1 3 4", or 3" hole spacing For doors from 1 3 8" to 2" thick Use pan mach screws 6 32 x 2 1 4"