HOLO-KROME 60166 3/4-10 x 2-1/2吋 內六角圓頭螺絲 | 平頭內六角驅動 | 合金鋼熱處理黑色氧化（25件/包）

Used them for a heavy jig fixture at work and the black oxide finish held up better than I expected through assembly. The socket drive seated perfectly with no wobble, which I appreciated. These are solid screws for the price.

Threads are clean and uniform across all 25 pieces, which made setting up my jig fixture a breeze. The flat head sits perfectly flush in counterbores, and the black oxide gives them a solid, professional look that hasn't chipped during assembly.

The black oxide finish on these screws resists corrosion nicely, and the alloy steel feels plenty tough for my workshop jig. I’ve used a handful already and the hex socket drive makes them easy to torque down properly.