Foseal OBD2 Extension Cable 12 Pin to 16 Pin Female OBD1 OBDII Connector Adapter for GM Vehicles/Car Diagnostic Tool Only use for GM vehicles. Standard OBD1 (12 pin) OBD2 (16 pin) diagnostic extension cable, brand new and high quality. The GM 12 pin Adapter allows you to connect compatible Diagnostic tools on a GM vehicle fitted with a 12 pin socket with your existing 16 pin OBD2 tool. Foseal OBD extension cable utilized eco-friendly materials, reduce environmental pollution. What you get: 1 * GM extension cable, our seller support team stand behind our products in any way.