Allen wrenches (aka hex keys) for tightening or loosening screws Includes 36 hex keys in SAE and metric sizes and with long and short arm lengths Made of durable chrome vanadium steel with a black oxide finish for rugged strength and rust resistance 2 hinged cases included, complete with dedicated slots for key storage and clear size markings for fast locating Ideal for working on bicycles, motorcycles, vehicles, furniture, machinery, and more Product dimensions: 7.40 x 3.39 x 1.65 inches (LxWxH)