6MIL HS-01 Hex Wrench Set Description: The 6MIL HS-01 hex wrench set features all the common hex key sizes you could need to work on your bike. Features ball-ends on the 4/5/6mm hex keys for added support and function in hard-to-reach spots Features: An economical hex key wrench set Heat-treated steel for hardness 2 / 2.5 / 3 / 4 / 5 / 6 / 8 mm hex wrench Ball-end wrench sizes are 4mm, 5mm and 6mm Includes durable plastic wrench holder