9/16-18 X 4" براغي ذات رأس أسطواني | محرك سداسي داخلي | ملولبة بالكامل | سبائك فولاذية مؤكسدة حرارياً باللون الأسود (25 قطعة/عبوة)

I was worried the 4-inch length would be too long for my jig, but they threaded in cleanly with no binding. The black oxide finish looks professional and hasn't shown any rust yet after a few weeks on the shop bench.

The hex socket drive fits snugly with my T-handle wrench, making installation in tight jig spaces a breeze. The black oxide finish gives them a nice, consistent look and seems resistant to minor scratches during assembly.

These are holding up great on my machining fixture; the black oxide finish gives them a nice uniform look and they thread in smoothly. Fully threaded all the way to the head, so I could cut them to length without any fuss.