All internal parts in the 250 Jacklegs are used in Stopers, Sinkers and Quarry drills. Drill delivers high penetration, and strong torque. Convenient operating controls, with push button leg retraction and adjustable motorcycle control feed on the backhead of the drill. Positive lubrication with strong front end blow. Larger mating faces between major cylinder components for longer life and less wear. Improved pusher leg is available with a stainless steel piston rod to prevent corrosion and pitting. Locking steel retainer for collared steel standard. Uses rock drill oil or grease.