Insert wires with ease using 3M™ Scotchlok™ color coded closed end Connectors, which feature a smooth, flared entry that lets you work quickly. The color-coding lets you identify the wire size you need at a glance and the copper insert provides excellent conductivity. Slide the wire where you need it and no further by using the built-in wire stop. This product is UL listed, CSA certified and RoHS 2011/65/EU Compliant.