9-piece hex head socket set with custom blow molded case. This is set includes (6) 1/4" Drive sockets: 4mm, 4.5mm, 5mm, 5.5mm, 6mm, 8mm and (3) 3/8" Drive sockets: 12mm, 14mm and 17mm

Basically you are getting a nice set of allen sockets which include the size needed for all Gen 2 allen head oil drain plugs for a few more $$ than a single packaged 8mm socket costs.