The Klein Tools 65300 21 Pc SAE KNECT Socket Wrench Set is a versatile and high-quality hand tool set designed for both metric and standard measurements. This set includes 21 pieces with a 1/4 inch size, perfect for a variety of applications. The socket type is designed for impact pass-through, allowing for easy ratcheting action and ensuring a secure grip. The set comes in a convenient case for storage and organization, making it ideal for both professionals and DIY enthusiasts. With its multi-functional features and durable construction, this socket wrench set is a valuable addition to any toolbox.