The Dillon Powder Measure Adaptor is a convenient interface between any other manufacturer's powder measure and your Dillon progressive reloading machine.
Paired with a Dillon RL 450 Powder Die (#20308) this adapter allows any manufacturer's powder measure with 7/8x14tpi threads to be used on the Dillon AT 500, BL 550 or RL 550B progressive reloading machines.