The Snap-on FS181 is a high-quality 3/8" drive 6-point SAE 9/16" flank drive shallow socket, designed for automotive use. Made in the USA, this chrome-finished socket features a durable construction and precise measurement. With a single piece design and standard socket type, this tool is a reliable addition to any mechanic's toolkit. Ideal for professionals and enthusiasts alike, the Snap-on FS181 provides a reliable and trustworthy option for fastening and loosening nuts and bolts.