Deadlatch - Builders Series C10064 This heavy duty chain door

This heavy duty chain door restraint can be installed to restrict the swing of a full size door

The pivot arm has an oval slot for adjustability of the gap between the gate frame and the post after installation

The round guide button at the end of the operator arm attaches to a track channel on the underside of the window

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Surface mounted

Deadlatch - Builders Series C10064 This heavy duty chain doorThese builders series products are value priced but still offer good quality. This Deadlatch (also known as a Nightlatch) is similar to a standard deadbolt, however, instead of needing to be manually operated by turning a key or knob each time, this lock has a latch which automatically re locks the door when closed. This is essentially a mixture between the trim of a deadbolt and the interior workings of your most common door knobs or levers.