HOLO-KROME 72176 براغي رأس مقبس 3/8-16 × 3-1/4 بوصة | محرك مقبس سداسي | فولاذ سبائك أكسيد أسود حراري (50/عبوة)

Needed a few for a jig I was building, and these threaded in smoothly without any binding. The hex socket drive gave a solid bite, and the black oxide finish looks clean. A perfect fit for the job.

The black oxide finish on these screws seems to hold up well without any rust forming on the threads. I used them to secure some heavy jig parts, and the hex drive seated perfectly with no stripping.

The black oxide finish on these screws matched my machine frame perfectly and they threaded in smoothly without any binding. Used them on a jig setup and all 50 pieces had consistent threads with no duds in the pack.