Made of Solid Steel These hex keys are made of heavy-duty premium chrome vanadium steel to withstand tough working conditions and high levels of force. Precisely cut end is chamfered for easy sliding into fasteners, reducing wrench wear and fastener head damage. Easy to Use Tools were designed for ease of maximum use, including long arm wrenches that allow for extra reach and leverage so you can get the torque you need to undo the tightest fasteners. Box of Compact folding storage included A compact folding case makes it easy to access tools and the high visibility SAE and metric sizes marked on the case will reduce time spent searching for the correct size wrench and increase overall project efficiency. You can carry the set everywhere and keep all Allen keys in order after your work! Wide range of uses This 30-piece hex key set completely covers all hex screws and contains SAE measurements and metric long and short arms for unlimited applications around the home, garage and garden.