HIGH-QUALITY ALLOY STEEL- This impact socket wrench set is made of extra solid alloy steel, resistant to abrasion and wear, this torque wrench has a sturdy construction that will not easily crack under high pressure for maximum strength and longevity. SUPERIOR PERFORMANCE- Whether you drive them with an impact wrench or by hand, these premium chrome vanadium sockets deliver superior performance. The impact socket set features a 6-point, high-torque design that contacts and grips the stronger flat sides of nut or bolt head, not the weaker corners. 19 SOCKETS INCLUDED- This effort-saving 1/2 inches drive impact socket set comes with 19 impact drive sockets: 3/8'', 7/16'', 1/2'', 9/16'', 5/8'', 11/16'', 3/4'', 13/16'', 7/8'', 15 / 16'', 1'', 1-1 / 16'', 1-1 / 8'', 1-3 / 16'', 1-1 / 4'', 1-5 / 16'', 1-3 / 8'', 1 -7/16'', 1-1 / 2''