SPECS: .308 & .30-06 Reamer Sets include: Pull Through (P/T) Reamer, Thrust Bushing and Extension Shaft. Shaft - 24" (60cm) long, ¼" (6.3mm) diameter, round shank. Use #184-054-653 Throater/.22 T-Handle to drive shaft. Reamers work on bolt action or semi-auto rifles.