This Affinity little handle bar shaped tool is machined in the USA from high grade tool steel, then TIG welded and hardened for durability. Fits perfectly in metric allen bolt heads #4, #5, and #6. Small enough to carry around. You will have this one for life!
Instructions: Make sure the wrench goes all the way inside the Allen Head. Lubricate the bolt threads and the underside of the Allen Head with grease.
Limited lifetime warranty against manufacturing defects.