Supercrazy M15 X 1.5MM Oil Pan Drain Plug Thread Repair Tool Kit SF0087C Ideal for repairing sump, gearbox and differential drain plug threads. Used to tap the damaged thread slightly oversize, then fit a new drain plug and washer. Take a washer through the new oil drain plug, and the insert a new oil drain plug. Tap material : CR-MO steel. Tap Size: M15 X 1.5MM.