براغي ذات رأس مقبس 7/8-14 × 2-1/4 بوصة | محرك سداسي | ملولبة بالكامل | فولاذ سبائكي معالجة حرارياً بأكسيد أسود (10 / عبوة)

Installed these in a jig I was building and the hex socket drive made tightening them a breeze. The black oxide finish looks clean and should resist rust in my shop.

Used a handful to mount a heavy steel bracket on my mill, and the black oxide finish held up perfectly against the cutting oil. The hex socket drove smoothly without any rounding, and the threads were clean right out of the package. Exactly what I needed for that precision fit.

Used them to secure a heavy jig fixture on the mill table, and the hex socket drive engaged without any stripping. The black oxide coating is a nice bonus, seems to resist oil stains better than plain steel.