Blue Demon - Model SH 800 -Replaceable Blade

The Type SH-800 bit is primarily designed for drilling with extra-heavy weights. Such drilling equipment generally uses up to 3½` 88.9mm) or 4½` (114.3mm) drill pipe. In formations predominantly shale where hard stringers are encountered, the 5⁵/₈` (142.9mm) through 8¾` (222.2mm) Insert Blades are most successful. In softer formations where 3½` (88.9mm) or larger drill pipe is commonly used, Insert Blades through 12` (304.8mm) are available and Rock Cutter Blades may be obtained in sizes through 16` (406.4mm).