This Lisle Metric Hex Bit Set (33850) includes 8 hex bits (2.5, 3, 4, 5, 6, 8, 10, and 12mm) in a convenient storage case. The bits are made from high-quality S2 tool steel for strength and durability and feature a 1/4 hex shank for use with any standard bit driver. The bits are also color-coded for easy identification.