HOLO-KROME 32104 براغي مقبس بنقطة كوب #10-24 X 3/4" | فولاذ سبائكي أكسيد أسود حراري (100 / عبوة)

Having stripped a cheap set screw on a pulley before, I appreciate how much harder and more durable these black oxide alloy steel ones feel. The hex drive engaged perfectly, and they held their torque without any stripping.

Installed these on a motor shaft coupler and the cup point bit into the metal perfectly without slipping. The black oxide finish seems durable and the hex drive seated smoothly with a standard Allen key.

These things are tiny and easy to lose, so the 100-count pack is exactly what you need when you're setting up a jig. The cup point bit into the shaft nicely and held firm without any slippage, even when I torqued it down with my hex key.