Designed for close tolerance holes in single pass or "one up" drilling operations, our Double Margin (DM) drill can be manufactured with coolant holes or with a solid body. The double margin construction enhances stability in the hole for close-tolerance holes in a single pass. This makes it ideal for Advanced Drilling Units (ADUs) that require bushings in the setup. With a total of four margins, the enhanced stability in the bushing allows the ADU setup to produce high quality, close tolerance holes.

Recommended point geometries, along with AMAMCO's close tolerances, allow the drill to be self-centering. This eliminates the need for spot drilling.

With broad design flexibility from the point geometry to the shank designs, AMAMCO can custom manufacture this drill in an almost unlimited number of configurations, depending on your application.