Copper Mechanical Connector Extruded Style One Conductor #6 - #14 - 1 Conductor extruded Copper MechanicalConnector is best for copper wire connections.Copper Connector Extruded Style One Conductor #6 - #14 features include: Solid One-piece 1 Conductor Copper Connector made from Extruded Copper for superior mechanical strength and excellent electrical performance 1/4" Hex Head Screw Suitable for Use with Copper Wire only Copper Mechanical Connector is rated 600V UL486A/CSA Listed Dimension Measurements = Inches Order Qty of 1 = 1 Piece Below is more info on our Copper Mechanical Connector Extruded Style One Conductor #6 - #14