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 Allen keys are housed in a sturdy, plastic caddy. The high-strength alloy steel ensures long-lasting performance while the dual-material comfort grip helps make gripping easier on your hands. It meets or exceeds ASME B18.3-2003.