براغي HOLO-KROME 32160 مقاس 5/16-18 × 1-3/4 بوصة من نوع Cup Point Socket Set | فولاد سبائكي مع أكسيد أسود حراري (50 / عبوة)

The black oxide finish on these is perfect for preventing rust in my shop, and the cup point holds tight on the shaft without slipping. I used them to secure a pulley and they haven't budged since.

These set screws bite into the shaft much better than the cheap ones I’ve tried before, and the black oxide finish looks clean. They threaded smoothly into the tapped hole without any binding, which was a relief.

I needed to secure a pulley on a motor shaft and the cup point on these set screws bit in perfectly without slipping. The black oxide finish gives them a nice look and they threaded smoothly into the tapped hole.