4255-001UDK QuickCable Universal Dies & Pin Kit for 250 / 250PRO Hexcrimp Tool that utilize these same dies, if you have the grey style dies see 4255-001D dies or 4255-001DK die upgrade kit. The Universal Die service kits will fit into existing hand crimp tools and will supersede all prior listed dies. For Hand Crimp tools, New Universal Die service kits 4255-001UDK will fit into existing old style hand crimp tools 4252, 4254, 4257, & 4258 all suffixes.