Cuts receiver thread minor diameter for the Piloted Tap/Mandrel. Cuts receiver lugs to equal heights. Uses Tap/Mandrel bushings (not included). Available Standard or .010" Oversize.
Big Book Catalog, Issue:66, Page:488
New Product Supplement, Issue:564, Page:020
SPECS: High speed steel. 10½" (26.6cm) long. .010" Over -1.012"diameter; Standard - 1" diameter.