HOLO-KROME 87220 M16-2 X 60mm 소켓 캡 나사 | 플랫 헤드 육각 소켓 드라이브 | 합금강 열처리 블랙 옥사이드 (25 / 팩)

I bought these for a jig fixture I was building, and the 60mm length was exactly what I calculated for the assembly. The hex socket drive grabbed securely with no stripping, and the black oxide really helps resist rust in my damp workshop.

The black oxide finish on these screws looks professional and held up well during assembly without any galling. Used them to secure a heavy-duty tooling plate, and the hex socket drive made installation much easier than a standard hex head. They feel substantial and well-machined for the price.

Installed these in a jig fixture this weekend and the black oxide finish held up well against the coolant spray. The flat head sits flush without needing to counterbore much at all.