Professional tool for commercial or occasional use. This kit provides new enlarged thread and replacement drain plug screws. For use when existing threads are damaged or worn away. Used to tap the damaged thread slightly oversized then fit a new drain plug and washer (which is supplied) Set is suitable for the most popular threads used on cars and light commercial vehicles. Renew the damaged oil drain thread. Provide replacement of oil drain nut. Manufactured from the highest quality steel. Covers a wide range of vehicle applications. SUITABLE FOR THE FOLLOWING VEHICLES AUDI / VW / BMW / CITROEN / FIAT / FORD / SEAT / HONDA / MAZDA / MITSUBISHI / OPEL / PEUGEOT / RENAULT / TOYOTA / VOLVO SET INCLUDES 4 X TAPS (M13 X 1.5BP / M15 X 1.5BP / M17 X 1.5BP AND M20 X 1.5BP) 20 X OIL DRAIN PLUGS (5 X M13 / 5 X M15 / 5 X M17 AND 5 X M20) 40 X COPPER WASHERS (10 X M13 / 10 X M15 / 10 X M17 AND 10 X M20) Tap material SKS3 Oil drain plug material 1015 Washer material copper High quality steel Precision made SIMPLE TO USE Disassemble the damaged oil drain screw choose a tap for example if the original diameter of oil drain hole is M14 then operator needs a M15 tap Use a tap wrench to enlarge the diameter of oil drain hole Take a washer through the new drain plug and then insert a new oil drain plug Complete in blow molded storage case.