The Black Diamond Metric Hex Key Set provides a complete range of metric sizes for assembling, adjusting, and servicing equipment that uses hex fasteners. This 13-piece set includes 1.5mm, 2mm, 2.5mm, 3mm, 4mm, 4.5mm, 5mm, 5.5mm, 6mm, 7mm, 8mm, 9mm, and 10mm to cover common metric applications. A great addition to any toolbox when you want the right key size ready for quick, controlled turns.