براغي ضبط نقطة كوب 1/4-28 × 2-1/2 بوصة | فولاذ سبائكي (100/عبوة)

The cup point really bites into the shaft—I tightened these down on a steel hub and they haven't budged a millimeter under vibration. Alloy steel feels substantial, and the 2-1/2" length gave me plenty of thread engagement.

These screws were exactly what I needed for a jig I’m building, and the hex socket drive made tightening them in a tight corner so much easier than a standard slot. The cup point tip seems to bite into the wood nicely without stripping.

The hex socket drive made installation in a tight spot much easier than I expected. The alloy steel seems sturdy enough for general use, though I wish the cup point was slightly sharper for starting threads.