The A-M series cable lugs are made from electrolytic copper tubing with a purity of over 99.9%. Annealing and electrolytic tin plating make the connectors easier to compress and more resistant to mechanical stress. The collar has a chamfer and an inspection hole to facilitate the insertion of the conductor into the ferrules and prevent stretching of the element wires. The length of the collar facilitates the insertion of the ferrules into the tool dies, thus simplifying wiring work.