Drill collar elevators are hoisting tools for drill collars with zip lift recess and drill collars with lift plugs in oil ... Drill collar elevators are hoisting tools for drill collars with zip lift recess and drill collars with lift plugs in oil ... 3/4,3,3 1/8,3 1/4,3 1/2,3 3/4,4,4 1/8,4 1/4,4 1/2,4 3/4,5,5 1/4,5 1/2,5 3/4,66 1/4,6 ...