A great, low cost method of continuous deep drilling with diameters ranging from 1" - 6 1/4". Threaded tube extensions are made from heat-treated high speed steel and are 12" in length. Larger sizes are available upon request with short lead times. We recommend using oil or other lubricant for easier connecting and removal of the barrels.
NOTE: For use with Cougar Wet Diamond Bits (CORW) featuring a removable cap.