Copper Tubular Lugs Free Sample Description Tin plating significantly enhances both mechanical and electrical performance. The half-moon inspection hole provides visual confirmation that the cable has been installed correctly when crimping. The bell mouth enables easy insertion of our finely stranded conductor. Advantages Clear marking on barrel indicates correct crimping. Annealed copper barrel maximizes crimping properties. Tin plating helps resist corrosive environments such as oil and gas, marine, petrochemicals and water industries. Flared barrel entry simplifies insertion of flexible, fine stranded conductor. Material Barrel -