Practical crimping tool for connectors on RJ10 telephone handsets, RJ11 and RJ12 telephones, fax machines, and modems, featuring an additional cable cutter and stripper for 6 mm and 12 mm unshielded flat cables. It provides particularly precise results through parallel crimping. The stripper neatly strips the cable to 6 mm when inserted at an angle and to 12 mm when inserted straight. It includes a longitudinal cutter for flat cables such as telephone wires. The forced lock prevents premature opening of the tool, allowing it to be opened only after fully compressing the handles. If the tool gets stuck during the crimping process, for example due to trapped foreign objects, it can be reopened using the integrated emergency release. The lever mechanism ensures energy-efficient opening and closing of the crimping tool, preventing hand fatigue.