RS Nylon Insulated Female Receptacle Crimp Terminals A range of nylon insulated double crimp female receptacle terminals made from brass with a copper sleeved barrel and flared nylon insulation. These insulated female receptacle crimp connectors are Color coded for use with different wire sizes and accept a variety of tab sizes. For suitable crimp tool please see stock number 267-3133 Red 0.5 - 1.5 mm2 Blue 1 - 2.6 mm2 Yellow 2.5 - 6.5 mm2