براغي ذات رأس أسطواني من HOLO-KROME 72271 7/16-14 X 4-1/2 بوصة | محرك سداسي | فولاد سبائكي مع أسود حراري (25 / عبوة)

Got these for a jig I was building and the hex drive seated perfectly without stripping. The 4-1/2" length was just right for the thick metal plates I was bolting together.

The black oxide finish on these is spot on—no flakes or uneven spots, and the hex socket drive seated cleanly on my Allen wrench. They’ve held up through a few heavy clamping jobs on my fixture table without any stripping. Exactly what I wanted for jig work.

I needed a batch of socket cap screws for a jig repair, and these 7/16-14 x 4-1/2" ones fit perfectly. The black oxide finish seems tough, and they threaded cleanly without any binding.