Make tightening and loosening bolts an easy job with this set of Allen Keys from Oriental. These heat treated hexagonal keys are made of chrome vanadium steel to ensure longevity and sturdiness. Set of 10 It includes 10 different sizes of hexagonal keys that are useful for any mechanical, plumbing or electrical jobs. Sizes This set of keys come in different sizes: 1.5 mm, 2 mm, 2.5 mm, 3 mm, 3.5 mm, 4.0 mm, 5.0 mm, 6 mm, 8 mm and 10 mm, so they can fit in with different sizes of fasteners. Durability This L-shaped tool is easy to use and helps you get any tightening job done in no time. They are heat-treated and can be used for a long period of time. Easy Storage These set of tools comes attached in a ring, so you can keep them hung in a hook for easy accessibility.