The Lyman Powder Measure Baffle is just what you need to maintain the ideal level of constant pressure in your rotor even if it happens to be low on powder. Essentially this powder measure baffle helps to increase the uniformity of your powder charges. The Lyman Powder Measure Baffle is a simple device crafted from high-quality aluminum to ensure a lifetime of durable performance. Simply fit this baffle onto any powder measure having a standard 2-inch diameter reservoir tube and you are good to go. It is as simple as that.