The Mac Tools 17 Piece Standard Hex Keys SH515APA set includes 2 extra of the smallest size, providing a versatile and comprehensive collection of hex keys for various hand tool needs. As a trusted brand in the industry, Mac Tools ensures high quality and durability in their products, making this set a reliable choice for professionals and DIY enthusiasts alike. With a model specifically designed for standard hex keys, this set is essential for any workshop or tool collection.