Sinclair Custom Type B Drop Tubes are made from clear acrylic with an aluminum sleeve for observing powder charges and ensuring a perfect fit.
Compatible with .22 caliber and up, the tubes come in a 3/16" inside diameter and four different lengths to accommodate high fill cases and longer bullets.
These drop tubes are directly compatible with Lyman, Dodd, Bruno, and older Sinclair/Culver powder measures without needing adapters.