This is a tilt latch, spring loaded, used for both single and double hung vinyl windows. Made of injected molded plastic, white with fasteners, for use on sash panels designed to tilt-in and down from the top for cleaning. These are 3 in. in length, 1-1/16 in. wide, 2 in. hole centers with a 5/16 in. backset. Each package has one left hand latch and one right hand latch.