براغي رأس كبس بمقبس 1-1/2-6 × 9-1/2 بوصة | محرك سداسي | ملولبة جزئيًا | فولاذ سبائكي مع أكسيد أسود حراري

Installed these in a jig plate today and the hex socket drive made tightening in tight spots so much easier. The black oxide finish held up well against the minor wrenching I did.

I was a bit skeptical about ordering such an unusual size online, but the hex socket drive made installation on my jig frame incredibly easy. The thermal black oxide finish looks professional and seems durable.

Finally found a cap screw long enough for a deep jig I was building, and the black oxide finish is holding up well to shop oil and grime. The hex socket drive engaged firmly without any stripping, which is exactly what I needed for high-torque tightening.