TIMES~Piston Crimper/NO Dies The CT-U crimp tool has these advanced features and benefits: more rugged than the HX-4 tool; machined aluminum components are optimized for strength; tool uses ¼ inch high strength alloy pins. Safety release lever allows the ratchet mechanism to be opened without completing the crimp cycle making it safer and more user friendly. Compatible with all die sets used with the HX-4 tool. Storage location in the crimp handle for a second set of dies.