The Snap-on 3/4" drive shallow and deep 6- and 12-point impact socket sets are heat treated to optimize impact service life with a lower hardness than hand sockets and are able to withstand repeated cycling loads of impact wrenches. A proprietary blend of special alloy socket steel provides a long life and great strength, and the Flank Drive wrenching system delivers up to 20 percent more turning power without slipping or rounding while exceeding ANSI performance standards.