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The 4mm shaft fits my driver perfectly and the steel feels properly hardened, no wobble when I torque down on small fasteners. Swapped out the old tip and it's held up through a full day of work without any wear marks.

Picked up a 5.5mm hex and it grabbed onto the fastener heads with zero wobble. The steel feels solid, and the 4mm shaft slipped right into my handle without any play. Exactly what I needed for those tight RC nut-driving jobs.

The 4mm shaft fits my driver perfectly, and the steel tip feels solid when I torque down on stubborn fasteners. Swapped out my old worn one and it’s been holding up great so far.