NYKKOLA 12 Pin To 16 Pin Female OBD1 OBD2 Diagnostic Tool Connector Adapter Car Cable For GM NYKKOLA brand is a registered trademark in the United States.NYKKOLA also stands for 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. 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. GM 12pin to OBD1 OBD2 connector. Package Included: 1 x GM 12 pin to OBD 16pin Diagnostic adapter cable.