Dth Class Rock Drill* Perfect For Deep And Large Diameter Holes* Hydraulic Rotary Head Provides 4,500 Ft/lb Of Torque At 25/70 Rpm* Good For Drilling Holes Up To A Diameter Of 6.75 Inches Cab Unit W/ Heat & Ac A Single Joystick Handles The Rod Changer Another Single Joystick Controls Tramming