براغي رأس مقبس HOLOG-KROME 73058 1/4-28 × 5/8 بوصة | محرك مقبس سداسي | فولاد سبائكي مؤكسد أسود حراري (100 / عبوة)

These are holding tight in my jig fixtures, and the black oxide finish looks sharp and doesn't smear off onto my hands. Threads were clean, and every one of the hundred screws seated smoothly without any binding.

The black oxide finish on these screws looks really clean on my jig, and the hex socket grabbed the driver firmly without any stripping. They seated flush and snug into the threaded holes, which is exactly what I needed for precision assemblies.

Finally, a pack of socket cap screws where the hex drive actually fits my Allen wrench snugly without stripping. These 1/4-28 x 5/8" alloy steel ones feel solid and the black oxide finish looks clean on my jig setup.