One player feeds the ball to a scrum-half who then passes out to teammates on etiher side. The ball can be fed along through or at different heights.
Rugby Passing Games
This drill can be used to focus on the scrum-half, or in general to help practice handling of any player.
The player feeding the ball should feed at different heights, from rolling it on the floor to throwing it in the air. The player in the middle will be bringing the ball in to control in his hands, and then pass it out to either their left or right. Keep a high inside elbow, push the ball across the chest and have the fingers pointing towards the target.