Restores Internal Threads After Welding
Specially manufactured tap easily cleans and chases the internal buttress threads after welding or shaping of the bolt handle. Quickly and safely removes heat scale and oxidation without altering the size or fit of the bolt shroud threads.
Big Book Catalog, Issue:73, Page:324
Big Book Catalog, Issue:73, Page:478
SPECS: High speed steel .528"-13, 60° buttress