This is a yacht-quality fitting, electro-polished to a mirror finish. Single round hole installation. Spring loaded latch operates with pull of lift ring and can be opened from inside the closure as well. Includes 1 slam latch, 2 keys, 1 retaining ring & 2 mounting screws, 1 adjustable latch catch. Dimensions: 2.5" outside latch dimension, fits 2" diameter hole.