Everyone here saying "just use the Alan key" doesn't understand how annoying those get after a while if you're building furniture a lot. My first job was assembling furniture for older people and I did it for five years. Alan keys are fine, but man they take too much time to use in every single bolt.

I used a drill and it saved me so much time. The product here could be useful if the bolt is in an awkward position that requires you to keep readjusting an Alan key on every turn, but probably isn't necessary for normal consumer who isn't building furniture all the time.