The Tolsen 20090 is a comprehensive set of 13 L-shaped hex keys designed for the assembly and maintenance of machinery, furniture, bicycles, and various other equipment. These tools are crafted from alloy steel to ensure durability during repetitive tightening and loosening tasks. Each key features a long construction that provides better reach into deep recesses, while the ball end tips allow you to turn screws at an angle, which is particularly helpful when you have limited space to maneuver. This inch-system set is a practical choice for anyone needing a reliable set of fasteners for equipment that follows imperial measurements.