The RCBS - Pro Trim Shell Holder Adaptor - Herter's is high quality and fits all single-stage reloading presses. All RCBS products are backed by a solid company guarantee, because everything this company makes, whether for sports hunters, military, Homeland Security, law enforcement officials, or other shooting enthusiasts, is precision engineered and made to provide years of service. This simple Shell Holder Adaptor can make a big difference in the efficiency of reloading sessions. The goal for reloaders is better control to improve accuracy and performance, which is exactly what this adapter offers.