HOLO-KROME 69618 M16-2 X 90mm 內六角螺絲 | 低頭內六角驅動 | 合金鋼 熱處理黑色氧化 (10 / 包)

The black oxide finish is genuinely smooth and uniform—no flaking or residue on my rags while fitting them into a jig. The low head profile cleared my mounting bracket where a standard cap screw wouldn't have, and all ten threaded in with a clean, consistent feel.

Was looking for low-profile fasteners for a jig build and these fit the bill perfectly. The hex socket engages cleanly and the 90mm length gives plenty of thread engagement.

The black oxide finish on these screws gives them a nice, even look that blends well with dark tooling surfaces. I used them to secure a jig plate and the hex drive seated perfectly without any stripping. They're a solid choice for precision assembly work.