3M Scotchlok Closed End Connector is an electrical crimp sleeve connector with a copper insert that allows for fast splicing of copper conductors. The connector is nylon-insulated, and is 600V-rated for building wire and 1000V-rated for signs, fixtures or luminaires. It withstands temperatures of -40 to 221 degrees F (-40 to 105 degrees C).3M Scotchlok Closed-End Connector is color-coded for quick and easy identification of the wire size required. It has nylon insulation, making it perfect for use in light fixtures, appliances and other electrical OEM applications. It allows for quick wire insertion with a smooth, flared entry. A copper insert offers good conductivity. RoHS 2011/65/EU Compliant.