TEK-Tools are used for primary and secondary connector kits (Eaton's Crouse-Hinds series connector kits only). Ratchet action prevents release until proper pressure has been applied to terminal, ensuring proper connection of terminal to wire or cable. Easy to operate emergency jaw release. Designed to perform 5000 cycles prior to requiring check of crimp pressure or calibration. Embossed die nests with gauge marking to identify terminals crimped with TEK-Tools.