Each lug is electro-tin plated to resist electrolytic corrosion. The lugs are installed using standard industry tooling. Chamfered ends ensure simplicity and ease of conductor insertion. 3M Scotchlok 30000 copper compression lugs are one-piece, seamless copper and are designed to cover a wide range of conductor sizes. They are available in one-hole, standard-barrel and one-hole and two-hole long-barrel versions. They are designed to terminate copper conductors.