Designed to crimp RJ11/12 and RJ45 pass-through connectors with additional crimping slots for shielded connector tails, this Jonard Tools UC-4511 RJ45 y RJ11/12 Modular Pass-Through Crimper with Tail Crimping Slots is perfect for any network technician working with Cat 3, Cat 5, Cat 5e, Cat 6, or Cat 6A cables. The vertical crimp action crimps RJ11, RJ12, and RJ45 pass-through connectors perfectly every time. It cleanly trims the wires flush to the end face of the pass-through RJ11/12 and Cat 6A RJ45 connector. Unique crimping slots in the middle of the tool crimp the tails of shielded RJ45 CAT6A connectors.