Another terrific security option for internal doors is offset barrel bolts, which also use sliding systems to provide an extra layer of protection. They are simple to install, with a catch plate and sliding rail that is locked into place with a rotatable knob.
One of the key differences between these products and other sliding locks is that these are suited for a more varied range of purposes. The cranked offset barrel bolts can be used for doors that do not sit flush which means they can be used on almost any area, including cabinets, benches and other openings.
They are also referred to as necked or cranked offset barrel bolts because unlike other options, the rail is not in a straight line. It features a crank or kink at the end which allows you to install them on basically any door, even if it is not sitting completely flush with the frame or the rest of the structure.
Inches: 1/4" to 4.5"