براغي تثبيت برأس مقبس نقطي M4 × 10 مم | فولاذ سبائكي مطلي بالزنك (1000 / عبوة)

Used a handful of these to tighten a chuck on a lathe toolpost — the cup point really digs in and holds solid. Pack of 1000 is way more than I need, but the zinc plating looks clean and they haven't stripped yet.

Finally got around to using these on a jig adjustment, and the cup point really does bite into the metal nicely. The zinc plating looks clean and seems durable so far for the price.

These M4 screws fit perfectly into my aluminum extrusion tracks, and the hex drive let me seat them flush in tight corners without stripping. The cup point really does help them sit flat, which solved a wobble issue I'd been having.