3/8" Drive 12-Point Metric 21 mm Flank Drive® Deep Socket | SFM21 Chrome (1/4" Spline) inches A : 1-1/4–1-27/64

inches A : 1-1/4–1-27/64

• Same as KRBCSST-CF except Smoke Skull pattern

• Usable space interior dimensions: 21

• Infiniti® and Mercedes® vehicles use 8 mm fasteners

3/8" Drive 12-Point Metric 21 mm Flank Drive® Deep Socket | SFM21 Chrome (1/4" Spline) inches A : 1-1/4–1-27/64Snap on sockets using the Flank Drive wrenching system grip the fastener on the flanks flats which deliver 1525% more turning power Nickel chrome alloy finish resists against rust and corrosion Manufactured from the highest quality proprietary steel, providing optimum strength and durability 6 point configuration and Flank Drive wrenching system Specifications Dimension E, Hex Depth, mm : 15. 1 Dimension C, Bolt Clearance Depth, mm : 48. 1 Dimension