Park Tool introduced the bicycle industry to the AWS-1C 3-way Hex Wrench Allen Key Set more than 20 years ago. The latest version is stronger and more comfortable than ever. They fit perfectly in the palm of the hand and provide tremendous leverage. Hexes are made from Bondhus Protanium? high torque industrial steel and are heat treated for long life. Tips of hexes are chamfered for a perfect fit.The AWS-1 now features color coded rings to speed finding the correct size. Blue- 4mm. Black- 5mm. Gray-6mm.One tool fits 4, 5, and 6mm hex bolts (three of the most common hex bolt sizes found on bicycles).Incredible leverage for the home mechanic&';s go to toolHex tips are chamfered for a perfect fit Made from high-torque industrial steel