A cast iron rim night latch with a replacement keep that measures 3-7/8" X 2-3/4 inches high with a 2-1/2" to center of keyhole. The key will hold the latch back till you push back on the draw and the brass toggle will hold the latch back until you release it.  What you see is what you get.

Please take a look at my other 200+ hardware items in my store, thank you.