Sockets? Available in standard and deep styles with parallel neck down feature to increase access to restricted fasteners. Standard Extensions? Available in 1/4″, 3/8″, 1/2″, 3/4″, & 1 drive sizes in the most commonly used lengths. Universal Joints & Adapters? Universal joints are available in 1/4″, 3/8″, 1/2″, 3/4″, & 1 drive sizes. Adapters are available in 1/4″, 3/8″, 1/2″, 3/4″, & 1 drive sizes. Slide locking mechanism securely attaches a socket to the extension. Available in 3/8″ & 1/2″ drive sizes in the most commonly used lengths.