Material(s): Zinc die-cast. Use: This pushbutton knob latch is designed for wood or metal screen and storm doors with 1 3/4" hole spacing. Features: Will fit doors up to 2: thick. For doors from 11/4" to 2" thick, use Pan Mach, screws 8-32 x 2/3/8 (not provided). One-piece shaft provides firm pushbutton action. Offers anti-lockout design. Inside latch has exclusive double-lock deadbolt security.