Dual Rotary Drills from Foremost have two rotary drives, including a lower rotary drive used to advance steel casing through sand, gravel, glacial till and boulders. The lower drive feeds and rotates the casing independently of the top drive. The casing is held securely in the lower drive by a set of power-operated jaws. Once the desired casing depth is reached, the drill continues drilling open-hole like a conventional top drive drill. There is no need to trip out or change tools when transitioning to open-hole drilling. The independent rotary top drive simultaneously handles a drill string, which can be equipped with a down-the-hole hammer, tri-cone or drag bit. Cuttings are typically evacuated with air, but drills can also be configured with pumps for mud or flooded reverse circulation drilling. 403/295-5800; www.foremost.ca