The Drifter is Designed for Long Hole drilling in underground mines, grouting hole for surface mining and construction applications as well as for drifting and tunneling.Drifter features a 120 MM piston diameter and a powerful impact and rotation mechanism.It is used with 1¼" & 1½" rope thread extension drill steels rods.The rotation mechanism can also be disengaged & the impact action used to rattle a tight joint or a jammed bit.