The Kobalt 337361 Extension is a high-quality 1/2" drive 20" chrome knurled section shaft socket tool designed for automotive use. Made with a specialty drive type, this single item extension features a SAE and metric system of measurement. The chrome surface finish ensures durability and reliability. Manufactured by Kobalt in China, this extension is a valuable addition to any mechanic's toolbox, providing the necessary length to reach deep nuts and bolts with ease.