براغي رأس كبس M4-0.7 × 25 مم | محرك سداسي | ملولبة بالكامل | فولاذ سبائكي فئة 12.9 مطلي بالزنك (600/عبوة)

Took a chance on these for a tooling fixture at work, and the 12.9 alloy steel feels seriously rigid—no flex when torqued down. The zinc finish is evenly applied and slid into my threaded block cleanly, no binding or burrs. For 600 pieces at this price, I'm stocked for years.

The hex socket drive grabbed my M4 driver perfectly without any slipping, and the zinc plating has a consistent, clean finish across all 600 pieces. I used them to secure a jig fixture on my mill, and the Class 12.9 hardness handled the clamping torque without stripping.

I was pleasantly surprised by how precise the threads are on these—they seated perfectly in my jig without any binding. The 600-count pack is a solid value for tooling projects.