The Irwin Folding Hex Key Set consists of 7 retractable Hex keys, housed in a high-resistance, polyamide and fibreglass handle. The ergonomic rubber grip ensures great comfort and ease of use. The keys are manufactured from black oxide chrome vanadium steel for strength and durability.The keys come in the following sizes: 2.0, 2.5, 3.0, 4.0, 5.0, 6.0 and 8.0mm.