Save Money By Adding Your Own Extension
If you can silver solder or braze your own extension onto a Liner Drill, these standard length, deep hole drills can save you money. Piloted to follow the original bore and have all the same high-grade features as our .22 Liner Drill: Deep hole flute geometry and special helix angle to prevent jamming; reinforced web for accurate hole dimensions; nitrided lands for long life.
Big Book Catalog, Issue:68, Page:178
Big Book Catalog, Issue:68, Page:485
SPECS: High speed steel. Pilot diameter/overall length; .22 - .215"/9.5", .25-20 - .248"/11", .32-20 - .302"/11.6".