HOLO-KROME 72354 براغي كاب مقبس 7/8-9 × 4-1/2 بوصة | محرك مقبس سداسي | فولاذ سبائكي أكسيد أسود حراري (10 / عبوة)

Installed these on a press fixture and the hex drive seated perfectly without any stripping. The 4-1/2" length gave just the right grip for my heavy-duty jig setup.

Installed these in a jig I was building for a milling fixture; the threads engaged smoothly and the socket drive made tightening them easy. I'm pleased with the fit so far—exactly what I needed for a heavy-duty application.

I had to clamp a heavy jig together and these bolt heads held without stripping—the black oxide finish is much tougher than standard zinc ones I’ve used before. For the price, they feel solid and drive smoothly, even in tight spots.