Requested by Uncle Sam.
Invented by Snap-on.

When your country comes calling, you answer. That's what Snap-on did when the U.S. government faced the challenge of building a new line of military aircraft. These game-changing planes required smaller, lightweight fasteners that carried uniquely large torque loads - and they needed a tool strong enough to do the job. Snap-on delivered a thin-walled socket that supplied more power without slipping or rounding. We patented the Flank Drive, and created a tool the industry had never seen before.