Whether you call them Allen wrenches, Allen keys, hex keys, or hex wrenches, these little tools always turn out to be more useful than you'd imagined. Not simply for putting Ikea furniture together, these days socket head screws are being used much more frequently, so Allen keys are becoming far more versatile.
Socket head screws, or Allen screws, are on everything including home door hinges, air conditioners, car engines, bicycle derailleurs, motorcycles, hobby equipment like air guns, and RC cars and much, much more.
So it's important to have a good-quality set of hex keys at arm's length, because you never know when you're going to need one. Whether you're looking for a standard set of hex wrenches, an Allen wrench multitool, or a set of ball-end hex keys, you've come to the right place.