A 4-way crimping tool is suggested for use. Material: Copper with nickel plating. Compatible with crimping tools like JRD-HDT-48 and ACT-M202 (for wire range 14-20 AWG). Fits connector series including HD30 Series, HDP20 Series, DRC Series, HD10 Series, DT Series, DRB Series, DTV Series, AEC Series, STRIKE Series, and Jiffy Splice.