The versatile 3-in-1 Impact Socket is a must-have for linemen and utility workers. It features three popular square sizes that can be quickly and easily converted for a variety of utility type applications. It also has a long, hollow shaft designed to fit over long threaded bolts. 3-in-1 impact socket features three square socket sizes: 3/4-Inch, 1-Inch and 1-1/8-Inch. 7/16-Inch hex quick-change adapter included. Fine tuned ball tip provides improved retention, minimizing drops. 13/16-Inch diameter, 6-Inch (152 mm) long hollow shaft allows use on long threaded bolts.