Crescent Allen Keys are available in fold-up or long-arm types in the most common sizes. They are manufactured from high-strength alloy steel and have size markings for each key. The long-arm hex keys are housed in a sturdy, plastic caddy. Crescent's dual material comfort grip Allen keys are machined from high-strength alloy steel and feature size markings for each key, making them quick and easy to find. The wide range of common sizes and clearly printed measurement types make them highly versatile.