Sinclair Custom Type A Drop Tubes are made of clear acrylic with an aluminum sleeve for observing powder charges and ensuring a perfect fit in powder measures.
The drop tubes cater to .22 caliber and up, with a 3/16" inside diameter, and are offered in various lengths, with the 10" option aiding in high fill cases.
Compatibility requires an adapter for use with Redding, RCBS, and Hornady Powder Measures, but fits directly into Niel Jones Powder Measures.