C.K Hex Key is constructed from high quality chrome vanadium steel that has been hardened and tempered to ensure long-lasting strength and durability. The hex keys feature a ball end so they can be used at an angle of up to 25° in applications with restricted access. This C.K Hex Key Set comes in a handy storage holder and consists of the following sizes: 1.5mm, 2mm, 2.5mm, 3mm, 4mm, 5mm, 6mm, 7mm, 8mm, 10mm.