براغي HOLO-KROME 86688 3/8-16 X 5-1/2" ذات رأس أسطواني | محرك سداسي | سبائك فولاذية مؤكسدة حرارياً باللون الأسود (50 / عبوة)

The black oxide finish on these is what sold me—they slide into blind holes without any galling, and the 3/8-16 threads cut cleanly every time. Fifty in the pack means I’ve got plenty for the next tooling project too.

Put these on a heavy-duty jig I’m building, and the black oxide finish is holding up well against chips and coolant. The threads started smoothly, and all 50 in the pack were clean—no duds.

I've been using these on my milling machine fixtures and the black oxide finish is holding up great against cutting oil. The hex socket drive makes them easy to tighten in tight spots.