This 4-blade Blue Demon has thicker, heavier forged steel blades with longer reamer inserts of high quality tungsten carbide which will insure full gage hole and reduce torque. The patented Blue Demon Deflector minimizes bit plugging.

The replaceable 4-blade bit is available in 4¼" (108mm), 4½" (114.3mm) and 4¾" (120.6mm) sizes for use in series AC-600 assemblies which consist of the following parts:

1. AC-600 connector with box of pin threads to adapt to drill pipe and with or without breakout lugs.
2. AC-600 4-blade bit shank - Blue Demon Part No. H064.
3. AC-600 special heavy duty locking bowl, Blue Demon Part No. H164. This special locking bowl cannot be used with other type AC-600 series Blue Demon replaceable blades.