Reversible Action for Internal and Exernal Applications. The heavy duty plier construction and larger tips are designed for larger snap rings. The tool quickly converts from internal to exernal use by pivoting the handles. Tough tool easily compresses internal rings and exands exernal rings. Conical tip ends prevent the snap ring from slipping off the tips. Ten tip sets in a handy plastic pouch are included to fit a wide range of snap ring sizes. Tips are easily interchanged by turning a set screw.