The Kobalt 3pc. 1/2" Drive Impact Extension Set and 4pc. Drive Adapter Set is a high-quality socket set designed for professional use. Made from durable chrome vanadium steel and steel, these sockets are designed to withstand high impact forces and provide a secure grip on fasteners. With a size of 1/2 inch and standard SAE measurement, this set includes 3 impact extensions and 4 drive adapters, making it versatile for a variety of applications. The Kobalt brand ensures reliability and quality, making this set a valuable addition to any toolbox.