We developed this handy steel adapter so you could use Sinclair Primer Pocket Uniformers in your Lyman, Hornady, or RCBS powered case prep center. Process cases more quickly and with less effort by harnessing the best primer pocket tool on the market with the available power source. Precision machined from durable, high-grade 303 stainless steel, so it will give you many years of service. Mfg: Sinclair International