This Proto Professional socket set includes three pieces in sizes 1/2", 9/16", and 5/8". The sockets are designed with a swivel socket type and a 12 point drive type, making them versatile for a variety of projects. The chrome surface finish provides durability and a sleek appearance. Manufactured in the United States, this set is a great addition to any automotive or hand tool collection. With a 1/2" drive size and SAE system of measurement, it is compatible with a range of tools. Whether you're a professional mechanic or a DIY enthusiast, this set is a reliable choice. Proto tool numbers are #5475, #5476 and #5477. New vintage sockets never used and in excellent condition.