HOLO-KROME 87020 M3-0.5 x 20mm 소켓 캡 나사 | 플랫 헤드 육각 드라이브 | 합금강 열처리 블랙 옥사이드 (100 / 팩)

The black oxide finish on these screws gives them a nice, professional look, and they fit perfectly into my machine tooling setup without any issue. I’ve used a few so far and they thread smoothly, so I’m confident the rest of the 100-pack will hold up well.

The threads on these M3s are perfectly clean and consistent across all 100 pieces—not a single one has stripped when torquing down into my jig fixtures. The flat head seats flush nicely, which is exactly what I needed.

Finally found M3 screws long enough for my jig project, and the black oxide finish looks clean against the aluminum. The socket drive bit worked perfectly with my standard hex key, no stripping at all.