This teng tools 9 piece set of hexagon keys is supplied in a handy folding plastic holder for easy storage the keys are made from chrome vanadium steel for strength and durability they have a long arm which allows access to more difficult to reach places and a short arm which ensures excellent torque and leverage colour black the teng tools ten1479mmr hex key set comprises the following key sizes 15mm 2mm 25mm 3mm 4mm 5mm 6mm 8mm and 10mm