AP-03 Gold Plug. M12 x 1.25 pitch. With a 12mm x 1.25 thread the Gold Plug AP-03 is used widely for Nissan and Toyota engines as well as many of the Lotus cars that use the Toyota engines

Thread Size:12mm
Thread Pitch: 1.25
Thread Length (with washer):10mm
Thread Length (with magnet):12mm
Head Size:15mm
Washer Included: Yes
Replacement Washer: SW-03