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: 1.5mm, 2mm, 2.5mm, 3mm, 4mm, 5mm, 6mm, 8mm and 10mm.