Aluminum, Push Button Key Lock, For Out Swinging Wood Or Metal Doors, Fits 1" To 1-1/4" Doors, Installation Hole Spacing 1-3/4", Installs In Three 5/16" Holes, Contains 2 Sizes Of Strikes & Shims To Provide Adjustment For Latching, No Locking Out Feature Prevents Accidental Lock Out, Key Lock For Extra Security.