Croft Hardware 2604 & ACC31
A stylish 90x35mm jamb bolt made from solid brass and available in various finishes. This product is supplied with a strike plate to protect the door frame. A door jamb should be fitted on the far side of a closed sliding door by the frame. Push the top of the lever until it makes contact to activate. This will prevent the door from opening, and the lever will make contact with the strike plate on the frame of the door. Push the lower end of the lever until it has returned to the original position, and the door will then be able to open.
And for emergency release of the jam bolt, ACC31 ferrule