Clymer 6MM Throating Reamers are made from high-quality M-7 High-Speed Steel for professional gunsmithing and are guaranteed to last a lifetime with proper care.
Rougher reamers are .010" smaller to save wear on the Finish Reamer for frequent use, while a Finish Reamer alone suffices for occasional chamber cutting.
Throaters feature 5 left-hand, spiral flutes, are .002" larger than bullet diameter with a 2½° throat angle, designed to lengthen the throat and increase freebore.