8 Flutes Give Smooth, Efficient Cutting
Gives the forcing cone a gentle taper that reduces recoil and
improves shot patterns. Provides a smooth transition for the shot
cup, with less pellet deformation, for greater pattern density.
Spiral flutes give a chatter-free cut on all types of barrel steel.The
long shank lets you alter most barrels using only a large tap
handle to turn the reamer.
Big Book Catalog, Issue:66, Page:496
SPECS: M-7 High Speed Steel. 8-flute, right hand cut with left
hand spiral. 9" (22.9) long, 3-½" (8.9cm) shank, 7/16"