The Klein Tools 65300KNECT 21-Piece SAE KNECT Starter Kit MODbox is a versatile and durable set of socket wrenches designed for both metric and standard measurements. Made from high-quality chrome vanadium steel, these pass-through sockets feature a ratcheting action for easy use. The set includes 21 pieces in a 1/4 inch size, with a multicolor design for easy identification. Additionally, the sockets are wear-resistant, magnetic, and multi-functional, making them a valuable addition to any workshop or tool collection. Ideal for professionals and DIY enthusiasts alike, this starter kit offers convenience and efficiency in one compact package.