HOLO-KROME 72080 براغي رأس تجويفي مقاس #10-24 × 1 بوصة | محرك تجويف سداسي | فولاذ سبائكي أكسيد أسود حراري (100/عبوة)

I was worried these might strip under heavy torque, but the black oxide finish held up perfectly on my jig assembly. The hex socket drive seated firmly without any wobble, and the threads cut in smooth. Exactly what I needed for precision work.

Threads are clean and the hex socket drive seated perfectly on my Allen key, no wobble or stripped edges even after torquing them into a jig. The thermal black oxide finish held up fine against the oil on my bench, and the alloy steel feels solid for the price. Exactly what I needed for a precision

The black oxide finish looks great and hasn't shown a hint of wear after being tightened and loosened dozens of times on my jig. Threads engage smooth and the hex socket grips the Allen key without any wobble.