Extra powder dies allow you to move your powder measure from toolhead to toolhead without changing the "belling" adjustment.Toolhead not included. These are for the RL550, XL650,and RL450 equipped with the automatic powder system.<br /><ul><li>Allow you to move powder measure without changing the belling adjustment</li><li>Fits the RL550, XL650, & RL450 Machines</li></ul>