High Power Connectors are available in 50, 175 and 350 amp ratings for use to 600 volts continuous AC or DC operation. For a matched pair use two housings of the same color Spring-loaded, silver plated, contoured contacts have a self-wiping cleaning action which ensures greater conductivity and longer life. Housings do not include connectors; pieces sold separately. Two (2) housings and four (4) contacts are required for a complete connection. Here is an informational video with some helpful hints.