12 Pieces retaining ring plier set, convertible internal/external, fixed tip. Contains: B106, B126, B136, B107, B127, B137, B108, B128, B138, B109, B129, B139. Includes plastic case. Professional industrial quality. Converts from internal to external or vice versa, when pivot switch is moved to adjacent tapped hole. Fixed tip are precision formed and hardened for accurate fit and long wear. large cushioned grips. Meets ergonomic criteria. Engineered to reduce fatigue.