If you want a good looking push button deadbolt for interior and exterior use this is the one to buy.

This is the lock that started it all.  A solid dependable push button combination deadbolt to be added above your existing lockset or used by itself. A latch can be substituted for the bolt and there is a key override option

A two, four, or five drawer file cabinet push button locking bar.

The bar lifts off the mounting pins and hangs out of the way on the side of the file cabinet during the day.  

When locked the bar is secured at the top and bottom.