Lee Bullet Feed Fit Automatically feeds bullets into the mouth of the bullet seating die for pistol calibers only. Can be used on the Pro 1000, Pro 4000, Auto Breech Lock Pro, or Load-Master Presses. if using it on Pro 4000 or Auto Breech Lock Pro, you will need a lock-ring and breech lock bushing for station #2. Used for 9mm to .365 diameter bullets, with lengths from .60" up to .75" long.