HOLO-KROME 32234 1/2-13 X 3" براغي مقبس كوب بوينت | سبيكة فولاذية مؤكسدة حرارياً سوداء (25 / عبوة)

I needed these for securing a gear on a shaft, and the hex socket drive made installation much cleaner than using a standard screwdriver. The thermal black oxide finish is nice and uniform across all 25 pieces in the pack.

Finally a set screw that actually stays put during assembly; the hex drive held up perfectly under heavy torque without any stripping. The cup point design made alignment on the shaft much easier than I expected for a headless screw.

The black thermal oxide finish seems more durable than plain black oxide, and the hex drive seated perfectly with my Allen key. These held a heavy bracket on my lathe without slipping.