The hex keys feature a chamfered-end design to help guide the key into the fastener. The Allen wrenches resist rotational distortion and come in a variety of SAE and metric sizes. The finish provides resistance to corrosion while the included caddies help you keep them organized. Keys are also stamped with sizes for easy identification in your work environment. The two color coded caddies also connect so you can keep all of your Hex Keys in one place.