Tuff Stuff 95353 8 Piece Metric (millimeter) Hex L Key Set 2mm - 8mm Pouched, specially designed with hex corners that are sharp and clean for a perfect fit. Pouch includes: 2mm, 2.5mm, 3mm, 4mm, 5mm, 5.5mm, 6mm, and 8mm. These Allen keys are heat treated for maximum strength, and they have a black oxide finish to resist rust.