Double Margin Drills are good for tight hole tolerances and stability when cutting non-ferrous materials and irons. Double margin drills have a second margin ground behind the main margin. The trailing margin burnishes the cavity, making a true hole and smoother finish while providing a more accurate, rounder drilled hole and frequently eliminating the need for reaming.

Double Margin Drill - Information

Double Margin Jobber Length Drills

Piloted Double Margin Drills

Cobalt Threaded Shank Double Margin Drills - NAS937

Double Margin - 6" Overall Length Extension Drills

Piloted Double Margin - 6" Overall Length Extension Drills

Hi–Lok^® Sizes Piloted Double Margin Drills

Cobalt Aircraft Stove Burner Drills

Cobalt Aircraft Stove Burner Drills - 6" Overall Length Extension Drills