Review on Highly Durable Texas Folding Hex Keys Set, SAE and Metric Allen Wrench Set, Enhanced Construction, S2 Heat Treatment Finish, Innovative Design, Pack of 2 by Chris Lentz

They are very well made and easy to use. They feel good in the hand, every detail swings easily and you can regulate the tension. As the description says, it's Metric and an SAE. They come with a lifetime guarantee as does the card they are on I think. My only complaint is that I had to disassemble every tool to take the indestructible card off. Each tool is attached to a hole punched in the card, and you must loosen the screw on one end to get the punched card out. You can't tear off a card, so I had to cut off a tool and then use it to remove a screw in another. Luckily they seem to have engineered it so that one screw can be pulled out of the other.