براغي رأس مقبس M4-0.7 × 16 مم | محرك مقبس سداسي | ملولبة بالكامل | فئة 12.9 من سبائك الصلب مع أكسيد أسود حراري (900 / عبوة)

Used a full box of these for a custom jig build, and every single screw seated perfectly without any stripping. The black oxide finish held up well against minor oil and handling during assembly.

The hex socket drive on these M4s is spot-on—no stripping even after I torqued them down with an impact driver. Fully threaded to the head, they gripped cleanly in my jig setup, and the black oxide made them slide into tight holes without any fuss. Solid pack for the price, honestly.

The thermal black oxide finish looks sharp and held up fine during assembly, and the hex socket drive seated cleanly every time with no stripped heads. A full box of 900 M4x16s in 12.9 alloy is a solid value for jig work.