The Snap-on 7/16″ Hex 1/2″ Drive Locking Pin Power Hex Shank A-3011A is a high-quality, single item adapter designed for automotive use. Made in the United States, this black oxide finished piece is perfect for standard socket types and features a 1/2″ drive size. The locking pin power hex shank ensures a secure connection for added strength and durability. It is 2-3/4″ Long, there is no owner’s mark on tool. Look at all the pictures, if you have any questions please ask. I have other tool items for sale on my page. Thank you for looking.