براغي ذات رأس أسطواني M16-2 X 30mm | محرك سداسي داخلي | كامل الخيوط | فئة 12.9 سبيكة فولاذية مؤكسدة حرارياً باللون الأسود (50 / عبوة)

Got these for a jig I’m building, and the hex socket drive makes tightening them in tight spots much easier than a hex head. The black oxide finish looks great and seems durable too. Exactly what I needed for a precise fit.

Installed these in a jig for a milling operation and the 12.9 grade steel held up perfectly under heavy load. The black oxide finish gives them a nice, consistent look and seems to resist grime better than the plain steel ones I've used before.

The hex socket drive bit cleanly without stripping, even torquing them down into hardened steel. Fully threaded to the head gave me great grip on a jig repair, and the black oxide finish hasn't shown a speck of wear.