Non-Insulated Terminals & Connectors: Non-Insulated Quick Disconnects/Slide Connectors: BUTTED SEAMS are formed when the metal is stamped, rolled, and butted to create the connector barrel. Should only be used with stranded wire and must be crimped in the proper place to avoid opening the seam. Non-Insulated Terminals & Connectors are made of 100% pure copper for maximum conductivity with the addition of tin plating for marine applications. Where applicable, serrated barrel offers increased pullout strength of hard-to-crimp solid or stranded wire. Can be crimped or soldered. 600V rating.