The PATLOCK security device is designed as an additional security device for pairs of French doors (patio doors). The device simply slips over the handles and locks in place by ratchet action. Removal is achieved by squeezing the release buttons on the device itself and parting.
Installation requires the remove of the handles on both doors and replacing the handle connection bars (spindles) which connect the handles together through your doors. These are replaced by the security spindles bars included. The new spindles prevent removal from outside if the external handle is removal in a attempted break-in.