National Hardware® N178-798 Universal Knob Latch, Satin BlackFor 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". Not provided, design is patented. Textured Black finish on the knob inset. Interior locking mechanism provides for enhanced security. Satin black Knob latch 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