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. 38 SOCKETS INCLUDED- This effort-saving 1/2 inches drive impact socket set comes with 19 standard sockets: 9mm, 10mm, 11mm, 12mm, 13mm, 14mm, 15mm, 16mm, 17mm, 18mm, 19mm, 20mm, 21mm, 22mm, 23mm, 24mm, 26mm, 27mm, 30mm, 19 deep sockets: 9mm, 10mm, 11mm, 12mm, 13mm, 14mm, 15mm, 16mm, 17mm, 18mm, 19mm, 20mm, 21mm, 22mm, 23mm, 24mm, 26mm, 27mm, 30mm and 4 extension bars: 3'', 5'', 10'', 15''