براغي رأس مقبس 3/8-24 × 7/8 بوصة | محرك مقبس سداسي | رقعة نايلون | ملولبة بالكامل | فولاذ سبائكي، أكسيد أسود حراري (100 / عبوة)

I've been using these for jig assembly and the nylon patch holds them secure even under vibration. The hex drive seats nicely with a standard Allen key.

The black oxide finish is really even and clean, and they seat perfectly in my tooling fixtures without any burs. The nylon patch holds them snug even under vibration, which is exactly what I needed for a precision assembly that gets constantly adjusted.

I've been using these in a jig I built for my drill press, and the black oxide finish is holding up nicely against metal shavings without any rust so far. The hex socket drive made installation quick with a standard Allen key, and they feel solid.