HOLO-KROME 72264 5/8-11 X 1인치 소켓 캡 나사 | 육각 드라이브 | 합금강 열처리 블랙 옥사이드 (25개/팩)

Threads cut clean and the black oxide finish has held up perfectly on my mill table after a few weeks of coolant spray. The socket drive seats deep so there's no stripping even when I torque them down hard. Exactly what I needed for a precision fixture.

I bought these for a jig I’m building, and the hex socket drive makes tightening them in tight spaces a breeze. The alloy steel feels solid, and the black oxide finish has held up well so far.

The black oxide finish on these is perfect—no oily residue like some cheaper packs, and they threaded into my fixture cleanly without binding. All 25 heads were uniform, which tells me the heat treat is consistent.