It consists of single-head single spiral, double- head single spiral and double-head double spiral.
Structure & Characteristics: The cutters used for rock spiral bit is the the cut teeth welded with tungsten-cobalt cemented carbide top. Among which, the single-head single spiral bit has fast drilling speed, easy cleaning and small rotary resistance. The double-head has good guide performance and strong soil-carrying capability. Generally, conic spiral bit is divided into 180, 270 and 360 degrees. The harder rock is, the larger top taper is.

Applicable Scope: It is applied for the harder bed rock, pebble and gravel bed with better cementing property and hard perennially frozen ground.