3.5 - 4.5 Inch Class Rock Drill Yh80rp Drifter Cummins 6ct8.3 Tier-ii Diesel Engine Approx. 4000 Frame Hours Approx. 2000 Percussion Hours. Set Up For T-45 Steel / Can Be T-51, If Needed. Hydraulic Centralizer, Extendable Boom, Dust Collector, Water Injection, And Rod Changer. Excellent Condition