THE NEW BLUEPRINT IN CASING ADVANCEMENT TECHNOLOGY Our newly developed ROTO LOC® is the best in class underreamer system. Wings that lock in place that ensure that a full diameter hole will be drilled. ROTO LOC® VARIETY OF SIZES WINGS LOCK IN PLACE 5 1/2 " to 36 " (140-914mm) From small-scale to large-scale drilling, Center Rock's ROTO LOC® offers the perfect solution for any job. ROTO LOC® is the only underreamer system that locks in place, making the need for ground resistance a thing of the past.http://centerrock.com/