This is a fitted powder measure funnel for the Dillon Precision powder measures. It is sized perfectly and has a rubber O ring to provide a nice solid fit to the top of the measure tube. It also has step down stem designed to work with most of the larger powder cans for putting back your leftover powder. This will not fit the small older tin cans. I also include a small magnetic button for hanging the funnel on the side of your strong mount or any other metal surface you choose to store the funnel. Please feel free to ask any questions and as always check seller feedback before buying on Ebay.