Wire ferrules are crimped onto a stranded wire using a crimping tool, protecting the fine strands from fraying, and then inserted into the terminal compartment. Ferrules are also useful because they allow for repeated insertion/removal and an elimination of the amount of stray wire strands. Insulated ferrules offer a larger guide for inserting the wire strands into the ferrules and may help assure a minimum bend radius is held in tight spots. The insulation is color coded for easier verification of gauge size.