Mortise lock for sliding patio door constructed out of steel.

This item is Discontinued. Replace with 15143 (will require some modification)

This lock requires a mortise installation.
It has a round end face plate with a horizontal keyway.
6-32 threaded holes on mounting flanges.
This design is used by door manufacturers such as Arcadia and W&F.

Hole Center: 3-11/16-inch
Keyway: Horizontal

Related items:
15117 - Square Face

Priced and sold each.