Copper compression connectors are manufactured from high-conductivity electrolytic copper. The connectors are normally tin-plated, lead-plated or plated with proprietary Burndy® brite finish to provide durable long-lasting corrosion resistance. The connector design has been matched to the cable size to provide the necessary physical strength requirements for reliable electrical performance. No inspection window is ideal for more corrosive environments as the barrel transition is not open Barrel is designed with an internal chamfer at the wire entry to ensure smooth insertion of the wire Long barrel allows for an increased number of crimps which will increase the mechanical strength of the connection Two hole tongue/tang is recommended when space permits as the 2-hole feature minimizes the terminations from loosening or rotating under vibration Connectors are clearly marked with stamping and barrel color coding