Klein Tools Compact Data Cable Crimper is a premium, long-lasting tool for CAT3, CAT5e and CAT6/6A cable using Klein RJ45 Pass-Thru connectors. Pass-Thru technology significantly reduces prep work time; wiring diagram on the tool helps eliminate rework and wasted materials. Compact, non-slip comfort grip reduces hand strain and stores easily. For use with Klein Pass-Thru Connectors (in packs of 10, 50 or 200).