This is a set of 13 high-quality hex keys from Allen. Each key in this set is equipped with a ball end, allowing an entry angle up to 25° in the screw to work in hard-to-reach areas. These specific keys utilize the United States customary system (sometimes referred to as Imperial). These wrenches will work for any SAE (Society of Automotive Engineers) parts.
Each hex key is composed of a black oxide-finished, tempered steel alloy and comes in a noninterference hinged "caddy" to provide easy access. All hex keys are precision-formed to exact dimensional tolerances for precise fit.