Includes 3 folding hex key sets (aka Allen wrenches) for tightening or loosening screws; includes 9 SAE sizes, 8 Metric sizes, and 8 Star sizes Ideal for working on bicycles, motorcycles, vehicles, furniture, machinery, and more Made of durable chrome vanadium steel with a black oxide finish for rugged strength and rust resistance Soft rubber inlays help ensure a secure, comfortable grip; keys fold down for compact storage Each piece measures 4.2 by 2.9 by 2.2 inches; backed by an Amazon Basics 1-year limited warranty