Fold-up drivers are a super convenient way to carry around a variety of common drivers all in a small package. The Swiss Army Knife was probably the first fold-up screwdriver, credit for the first fold up hex tool would probably go to Bondhus with the invention of the Gorilla Grip
in 1996. Since then, many other similar tools have been made by several well-respected toolmakers. Fold up drivers are a great investment and convenient for easy jobs, or on the go occasions like biking.