HOLO-KROME 720003678 براغي رأس مقبس 1-8 × 1-3/4 بوصة | محرك مقبس سداسي | سبيكة فولاذية مؤكسدة سوداء حرارياً (10 / عبوة)

Installed these in a jig I’m building, and the thermal black oxide finish handles the clamping force without any galling. The socket drive seated cleanly and held torque perfectly.

The hex socket drive fits my hex wrenches perfectly without any wobble, and the alloy steel feels solid for clamping down jig fixtures. I've already used a few in a tooling setup and they tighten up nicely without stripping.

The black oxide finish on these cap screws looks clean and uniform, and the hex socket drive seated perfectly with my Allen wrench. They held a jig together through a full day of drilling without any give.