This pre-1900 door bolt has the Eastlake pattern (1870-1890). It is a surface-mount bolt lock that fastens to the bottom of the door in order to anchor or lock the door to the floor. The lock is engaged by stepping onto the platform which forces the plunger into the floor (1/2-inch). The lock is released by pushing the button. The lock has a strong spring. It is made of cast iron.
The door bolt measures 5 1/4 inches vertically and 2 1/4 inches wide. We have cleaned and oiled this antique. It works very well. Screws will be included.