10 Pc. 12-Point Triple-Square "XZN" Socket Set. Includes 7 Triple Square 4, 5, 6, 8, 9, 10 & 12mm and 3 Triple Square Tamper-Proof 14, 16 & 18mm sockets are all packed in a Blow Mold Case 
Sizes 4, 5 & 6mm use a 1/4" square drive. Sizes 8, 9, 10 & 12mm use a 3/8" square drive. Sizes 14, 16 & 18mm use a 1/2" square drive 
Service fasteners on VW, Audi, Porsche, BMW, Volvo, Mercedes-Benz and some Detroit Diesel engines