Flank Drive® 21mm Metric 6-Point Flat Impact Socket with 3/8" Drive

Characteristics
• Snap-on® impact sockets are heat-treated to optimize impact life with a lower hardness than manual sockets and are able to withstand repeated cyclic loads from impact wrenches.
• Snap-on uses a proprietary blend of special alloy steel for sockets that provides long life and strength. The Flank Drive® wrench system delivers up to 20% more turning power without slipping or rounding, while exceeding ANSI® performance standards. Specifications: Dimension E, Hex Depth, mm 11.9; Dimension C, Bolt Clearance Depth, mm 17.9; Dimension B, Drive End Diameter, mm 29.4; Country of Origin: USA; Size, mm 21; Dimension D, Length, mm 31.8; Finish: Industrial Finish; Dimension A, Hex End Diameter, mm 29.4; Style: 6-Point Sets; Warranty: Lifetime warranty, non-repairable, guaranteed for materials and workmanship/for as long as the purchaser owns the tools. Warnings: For complete warning information, see CAT1600 pages W1-W4