Abstract: A latch structure incorporating a housing and a bolt plate movable therein is attachable to an edge of a sliding door adjacent a corner thereof where the bolt plate may move into registry with openings formed in a flanged track in which the sliding door moves. A fastener secures the housing to the edge of the door and a thumb screw engages the bolt plate through a slot in the housing to enable the bolt plate to be moved relative to the housing and secured in fixed position relative thereto.