With 6 double ended keys offering 12 different size options this kit should make easy work of removing virtually any oil drain plug likely to be found on the underside of a vehicle sump, gearbox or differential.
 
HEX key drive sizes AF 5/16″, 3/8″ & 1/2″, Metric 8, 10, 12, 14 & 17mm.

Square key drive sizes AF 3/8″ Metric 8, 11 & 13mm.

All can be driven using 21mm hex drive socket or 14mm spark plug socket (not supplied).