Note: I wouldn't run this with your best player at the five, but I would run it with a secondary shooter at the five that the defense isn't going to key on right away.
The set is a 23 high with the post on the ball side at the first hash mark, just below the FT line. On the guard to guard pass the post (5) sets a curl screen for the backside wing (4) who cuts over the top of the screen. If they really cheat it, the wing (4) can reject the screen and backcut in a Princeton or Dana Altman 2-3 High fashion. That look because very effective against an aggressive team.
As the wing (4) comes off the screen the guard who passed the ball (2) sets a quick downscreen for the screening player (5) in a flex like action. The inside man (5) pops up for the shot. Again, this screening action makes it look as if we are looking for the curl. The defense is going to help on the curl and become an easier target for the downscreen.
An easy counter to this set is having the shooter/post (5) backscreen the passing guard (2) after setting the curl screen for the wing (4). After setting the screen backscreen the shooter (5) pops back for the shot.
Another simple counter is to have your guard pass the ball, V cut and get it back. As that happens the wing (4) pins the shooter (5) who pops to the wing for a shot.
As usual, nothing new or revolutionary here, but this set is an interesting way to get a secondary shooter some looks without drawing immediate attention to them. This would be a helpful set if you ran Princeton, a 2-3 High, or even a 4 Out Motion offense as it starts that way and you can run it right into the offense. Either way, I like the idea of using the shooter as a screener first, then getting them open for a shot. It puts their defender in a tough spot - help on the first action or stay with the shooter.