براغي رأس أسطواني بمفتاح سداسي 4-BA × 5/16" | محرك سداسي | سن كامل | فولاذ سبائكي بأكسيد أسود حراري (100/عبوة)

The hex socket drive fits my Allen wrench snugly—no wobble or stripped corners when I torqued them into a jig. The black oxide finish looks sharp and should resist rust in the shop.

The black oxide finish on these is really nice and uniform — no chipped coating like cheaper packs I've tried. They threaded smoothly into my jig fixture without binding. A solid buy for precision work.

I needed some decent 4-BA screws for a jig I was building, and these hex socket ones fit the bill perfectly. The black oxide finish gives them a solid, professional look, and the fully threaded body grabbed the tapped hole with no fuss at all.