Fits around barrel to provide a solid guide for cutter. Helps prevent chatter marks caused by uneven pressure or irregularities in the barrel steel.
Big Book Catalog, Issue:67, Page:480
Mini-Catalogs, Issue:05, Page:014
New Product Supplement, Issue:593, Page:019
SPECS: Steel. Fits 1⁄2", 5⁄8" and 3⁄4" diameter cutters. Includes instructions.