Kell-Strom 73030-GS20782-1 Torque Wrench Extension 1/2" Sq. Drive

A specialised torque wrench adaptor wrench used in aviation maintainace tasks and is often used  with Pratt & Whitney engines.

It features a 1/2" Sqaure drive on one end and a 4/5" 12-point socket on the other end.