This was a horns set that was on a scouting tape. This team has a nice post and ran this set for him OVER AND OVER with success. It's simple, but every coach should add it to their tool belt - I know I have! It's pretty similar to what Spain was doing during the Olympics - although this film was from 2008.
This starts as a basic horns set with the point guard (1) coming off the high screen on the side of the stud post. The point (1) bounces out to the wing, stud post rolls (look inside), and the opposite post (4) pops high.
Throw the ball back to the high post (4) and go right into the stud post (5) who sealed off the roll if he didn't get it.