HOLO-KROME 73056 براغي رأس كبس مقاس 1/4-28 × 1/2 بوصة | محرك سداسي | فولاذ سبائكي مع أكسيد أسود حراري (100/عبوة)

Used a handful of these to secure a tooling fixture on my mill table, and the hex socket drive made installation quick with a ball-end Allen key. The black oxide finish seems to hold up well against light coolant splash without rusting. Exactly what I needed for precision work.

Put these into a jig for drilling aluminum parts and the hex socket drove true every time without stripping. The black oxide finish held up nicely against cutting fluid, which surprised me. Exactly what I needed for fixturing work.

I needed a batch of 1/4-28 x 1/2" screws for a jig I was building, and these seated perfectly into the threaded holes without any binding. The hex socket drive took an Allen wrench without stripping, which was a relief after using cheap fasteners before.