• ProGuard™ finish offers up to 5x more corrosion resistance than competitor finishes
• Chrome finish complies with military spec MS-33787 and MIL-W-8982
• Includes FSMS8-FSMS19 (8-19 mm) in magnetic storage tray
• Double Slide (included) : No
• Description (Chart) : 1/4" Square Drive
1/2" Drive 6-Point Metric 21 mm Flank Drive® Thin Wall Extra Deep Impact Socket | SIMMF21A Air • ProGuard™ finish offers upSockets are 34% thinner than a standard thin wall socket Use to access nuts on long studs and other hard to reach areas Ideal for wheel lugs Industrial finish helps prevent corrosion Specifications Dimension C, Bolt Clearance Depth, mm : 50. 8 Dimension B, Drive End Dia., mm : 28. 6 Country Of Origin : USA Size, mm : 21 Dimension E, Opening Depth, mm : 25. 4 Dimension D, Length, mm : 76. 2 Dimension A, Socket End Dia., mm : 28. 6 Finish : Industrial