The Matco Tools 12″ Locking Socket Extension is a high-quality hand tool designed for automotive use. Made in the United States, this extension features a 3/8″ drive size and a knurled design for a secure grip. Its chrome surface finish ensures durability and protection against corrosion. With a single piece included in the set, this extension is perfect for reaching tight spaces and accessing nuts and bolts with ease. Ideal for professionals and automotive enthusiasts alike, this extension is a valuable addition to any toolbox.