The DEWALT® U-Type Copper Dies produce cULus Classified crimps with leading manufacturers' connectors when used with the DEWALT® DCE310 20V MAX* Compact Crimper (see user manual for compliant chart of dies and connectors; connectors and crimper sold separately). The DEWALT® dies feature laser-etched markings and industry-standard color coded markings to help users clearly distinguish between die sizes. Wire sizes are imprinted onto connectors after a completed cycle for simple inspection.