The Proto Professional Set of 3 Adapters includes sizes 3/8-1/4, 1/2-3/8, and 1/4-3/8, making it versatile for various automotive tools and equipment. These standard SAE socket adapters are chrome finished and manufactured in the United States by the trusted brand Proto. The set offers convenience with its three pieces, ensuring you have the right adapter for any job. Ideal for professionals and automotive enthusiasts alike, this set provides quality and reliability for your next repair or maintenance project.