The Klein Tools 19-Piece Long Ball End Hex Key Set features both SAE and Metric sizes, providing versatility for various applications. Made from high-quality steel, these hex keys are designed for durability and long-lasting performance. The ball end allows for easy access to fasteners at angles up to 25 degrees, making it ideal for tight spaces. Each key is marked with its size for quick identification, and the set comes in a convenient storage case for organization. Perfect for professionals and DIY enthusiasts alike, this set meets ANSI standards for quality and reliability.