Hardened and heat treated Chrome Molybdenum steel Total Drive® impact sockets with a phosphate finish for corrosion resistance. All are suitable for Spline Metric Hex and Metric Bi-Hex and many are equivalent to TRX-Star* Whitworth Imperial Hex and Imperial Bi-Hex. Suitable for use with air/electric impact guns. Supplied in storage case.13pc 1/2Sq Drive Total Drive® Impact Socket Set• Hardened and heat treated Chrome Molybdenum steel Total Drive® impact sockets with a phosphate finish for corrosion resistance.• All are suitable for Spline Metric Hex and Metric Bi-Hex and many are equivalent to TRX-Star* Whitworth Imperial Hex and Imperial Bi-Hex.• Suitable for use with air/electric impact guns.• Sizes: 10 11 12 13 14 15 16 17 18 19 21 22 24mm.• Supplied in storage case.• Lifetime guarantee*.• Model No. AK5613TDModel No: AK5613TD:Brand: Premier:Quantity of Sockets: 13:Type: 1/2Sq Drive - Standard:Contents: 10PTDSEAAK5613TD