Blue Demon - Model AC 600 -Replaceable Blade

The Series AC-600 bit is designed for heavy weight drilling, usually employing the use of 2³/₈` (60.3mm) or 2<sup>7</sup>/<sub>8</sub><sup>`</sup> (73mm) tool joint or heavy-duty drill pipe to drill holes from 4¼` (108mm) through 5<sup>5</sup>/<sub>8</sub>` (142.9mm). While drilling through shale and other formations of similar strength with 6` (152.4mm) or larger bits using 3½` (88.9mm) and 4½` (114.3mm) drill pipe, it is recommended that Series SH-800 bits be used. The AC-600 bits in sizes 3<sup>7</sup>/<sub>8</sub>` (98.4mm) through 4¹/₈` (104.8mm) are for air drilling only.