These are really hard to find since no one makes anything like them. They were either produced by Moody or Weathermatic. (Moody didn't always stamps its equipment whereas Weathermatic did) You get 4 brass stream sprinklers that can mount onto a 1/2" riser. One of them is one-piece the other 3 the nozzle can be removed. They are all the same pattern: 1/3. I briefly tested them and they all have a standard angle spray. Someone put an "H" on the top of one with a black pen out of confusion. All of them are marked "S18 1/3" however. These are rare and the pattern is also unusual. Brass 1/3 stream spray nozzles disappeared in the mid-1980s so these are likely around 50 years old.