WITH ROTO LOC CENTER ROCK'S ROTO LOC® CASING ADVANCEMENT MADE EASY Wings Retracted Wings Extended * Sizes from 5 1/2 " to 36 " (140-914mm) * Wings lock in place to cut full diameter through any rock formation * No expensive starter casing teeth or ring bit left in hole * Easily retractable and replaceable wings * Straight holes in pinnacle limestone & karst, eliminating bent or broken casing ® Our Wings Lock in Place OVERBURDEN DRILLING SYSTEMhttp://www.centerrock.com/