Snap-on Tools RARE 3/8" Drive 13mm 6pt Shallow Surface Drive And Spline Drive
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Snap On 3/8 Drive 13MM Metric 6 Pt Shallow Surface Drive RARE DFM13

Dfm13 13mm spline drive 3/8” drive

Mfimm13 6 point 3/8” drive

DFM13: 13mm Spline Drive Socket

The DFM13

 (often associated with Snap-on or similar professional brands) is a specialty socket that uses a spline drive system for maximum versatility. 

Universal Compatibility: The spline design allows the socket to work on multiple fastener types, including spline, 6-point, 12-point, square, and Torx.

Damaged Fastener Recovery: These sockets are specifically noted for their ability to grip and turn fasteners that are up to 50% rounded off.

High-Torque Performance: Spline sockets distribute force over a larger surface area, reducing the risk of further fastener damage while applying high torque. 

The MFIMM13 is an industrial-grade socket typically manufactured by Snap-on and designed for high-repetition assembly and disassembly. 

Magnetic Retention: Features a built-in magnet to securely hold nuts and bolts inside the socket, preventing them from falling out in tight or deep engine bays.

Industrial Finish: It typically features a black-oxide finish rather than chrome, which provides corrosion resistance and is preferred for power tool use.

Power Tool Optimization: According to Snap-on, this "Power Socket" is designed for use with power nut runners; however, it should not be used with impact drivers due to its construction.

Flank Drive System: It utilizes the Flank Drive wrenching system, which grips the flats of the fastener rather than the corners to prevent rounding.