Towing Maintenance Kit, Tool Type 4/5-Way Flat 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 7893 7-Way Flat Spade Pin Trailer Circuit Tester, 8023 7-Way Flat Spade Pin Connector Cleaners, 8030 2 mL Contact Cleaner, Number of Pieces 3