- Superb 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 (supplied). - Set is suitable for the most popular threads used on cars and light commercial vehicles. - Tap Sizes: M13 x 1.5, M15 x 1.5, M17 x 1.5, M20 x 1.5mm. - Supplied in storage case.