The 3 in 1 Modular Crimping Tool is a versatile tool designed for both RJ45 and RJ11 connections, with the added bonus of a network tester and fittings included. This crimping tool is perfect for professionals in the cabling industry who need to quickly and efficiently crimp multiple types of network connectors. The modular design allows for easy switching between RJ45 and RJ11, while the built-in network tester ensures a reliable connection. This tool is a must-have for anyone working with computer cables and networking equipment.