Steren 300-504 4 Conductor Plugs Modular Crimping Tool Phone Plug Connector RJ11 RJ-11 RJ22 RJ-22 Cutter Stripping Line Cord Kit Base Standard Install, Extensions Snap-In Hook-Up, Part # 300504
Built-in cutting stripping blade suitable for RJ-11 and RJ-22 phone plugs.
Instructions: