For great results on the job, choose the 3M™ Scotchlok™ Butt Connector. Its butted-seam barrel's rigid polyvinyl chloride sleeve simplifies accurate wire insertion, while the built-in wire stop provides proper alignment. The vinyl sleeve's insulation fends off abrasion and assists with accurate wire crimping. Enjoy the electrolytic copper construction's great conductivity and the tin-plated exterior's defense against corrosion. This connector comes UL Listed, CSA Certified and RoHS 2011/65/EU Compliant.