Sinclair Custom Type B Drop Tubes are made of clear acrylic with an aluminum sleeve for observing powder charge and ensuring a perfect fit.
Designed for 6.5mm and larger calibers, the tubes have a 1/4" inside diameter and come in various lengths, with the 4" option available for high fill cases.
These drop tubes are compatible with Lyman, Dodd, Bruno, and older Sinclair/Culver style powder measures without needing adapters.