HOLO-KROME 69602 M16-2 X 45mm 內六角螺絲 | 低頭六角驅動 | 合金鋼 熱處理黑色氧化 (10個/包)

The black oxide finish wiped clean easily and looks uniform across all ten, which matters when they're visible on a jig. Threads engaged smoothly into pre-tapped holes without any binding, and the low head profile gave me just enough clearance under a tight guard.

I needed low-head screws for a tight clearance on a jig, and these M16s fit perfectly with plenty of thread engagement. The black oxide finish looks clean and should resist rust in my shop.

Perfect fit for the precision machining fixture I was assembling—the low-head profile cleared the tight clearance without any modifications. The black oxide finish seems durable and should resist rust well in my shop environment.