The PROTO® HEX KEY 5/16 ROUND HEAD is a robust tool designed for efficient fastening and loosening of hexagonal screws. Manufactured by BLACK & DECKER's IRWIN brand, this hex key is made from high-strength steel, ensuring durability and resistance to bending or breaking. With a 5/16 inch size, it is ideal for a variety of applications, including automotive and machinery repairs. The round head design allows for easy access in tight spaces, making it a versatile addition to any toolbox. This hex key meets industry standards for quality and performance, ensuring reliability in every use.