Rock Drill Machine Model KSC-120 F Drifter "KSC Speed Drifter" is designed for both under ground & surface drilling, having reversible rotation, system which can also be disengaged, leaving the impart mechanism in operation for releasing a jammed bit. Flushing can alternatively be done either with air or water the drifter is equipped with a sealed cuck for 1. 1/2" to 2.2/4" shank rods to suit difference application.