Sinclair Custom Drop Tubes are clear acrylic so you can observe your powder charge as it drops. Each drop tube is fitted with and aluminum sleeve to insure a perfect fit in your powder measure or drop tube adapter. Our .17/.20 caliber drop tubes are available in 4" length and 0.188"" inside diameter. Type A Drop Tubes will require an Adapter for use with Redding Powder measures (749-010-851) or RCBS and Hornady Powder Measures (749-002-916). Type A Drop tubes fill fit directly into Niel Jones Powder Measures. Mfg: Sinclair International
