Vinyl window Tilt Latch, Slide-In Plastic Square housing, Scallop Nose & Deluxe Actuator, Latch is slightly recessed (not flush) with side of housing
May be Interchangeable with other ones that look similar, note the width of the latch width is most important.

Housing Width: 11/16 inch
Housing Length: 2-11/16 inch
Housing Type: Square ( Square or Round )
Latch Bolt: Scallop ( Standard or Scallop )
Nose Size: 1/4 inch .248 ( 5 Widths) 503138
Stile Snap In: 3/16 inch .195 ( 5 positions available)
Actuator: Deluxe ( 4 choices )
Material: Plastic
Color: White
Priced and sold in pairs.

Additional Information:
* Housings are square or round, either will work on most windows
* Latch Bolt are Straight or Scallops, the scallops are mostly the larger widths and are interchangeable when widths are the same.
* Stile Snap in on bottom of housing vary, some have number to ID the offset. This is not critical on most windows. This holds the housing in place.
* Actuator is decorative only, does not matter which one you have, They will all work the same.