HOLO-KROME 72352 7/8-9 × 4" براغي رأس كب | محرك سداسي | فولاذ سبائكي مؤكسد أسود حراري (10/عبوة)

The black oxide finish on these 7/8-9 x 4" screws gives them a nice, uniform look and seems like it will hold up well in my jig setup. Threads were clean and the hex socket engaged perfectly with my driver.

These 7/8-9 x 4" socket cap screws fit perfectly in my milling machine's tooling fixtures. The hex drive made installation straightforward, and the thermal black oxide finish seems durable.

The black oxide coating on these screws handled the oily shop environment perfectly, no rust after a month. My press fixture needed something this precise, and the socket drive was a breeze with my Allen key. Exactly the strength I was counting on for heavy-duty assembly work.