Each connector comes with holes that let you easily pass colored networking wires through so you can easily verify the proper wiring order. To improve electrical performance, the connector secures the cable jacket tightly in the back, reducing the distance between the wire twists and contacts. These connectors can be used with solid or stranded wires and feature a one-piece design with no bars or liners. For use in CAT6 compliant data networks Category 6 performance per EIA/TIA B.2 FCC compliant, UL rated, and RoHS compliant Easy to verify wire sequence Simple one piece design with no bars or liners Works with solid or stranded wires The connectors come with a 1-year warranty, 30-day money-back guarantee and free lifetime US-based technical support.