This is a bolt designed for large doors, such as barn doors or double entrance doors. These bolts are used vertically. The lower bolt (shown) usually slides into a pipe in the floor. The upper bolt slides into a surface mounted receiver, which is included.
Toby, who is semi-retired, fills in as electronics technician, database programmer, and web-dabbler. He does all of our IT and helps out in the office, shipping, and even the factory once in a while.