Towing Maintenance Kit, Tool Type 7-Way Round Pin Maintenance Kit, Testing Application Electrical Circuits, Compatible Voltage Systems 12V DC, Probe Material Anodized Aluminum, Cord Material Not Applicable, Features Enhances Electrical Contact Points and Extends Harness Life, Removes Corrosion from Truck and Trailer Connectors, Includes 7865L 7-Way Round Pin Tractor Trailer Circuit Tester, 8024 7-Way Round Pin Connector Cleaners, 8030 2 ml Contact Cleaner, Number of Pieces 3