براغي ضبط رأس كوب بنقطة مقعرة 3/8-16 × 1-1/4" مع رقعة نايلون | فولاذ سبائكي (100 / عبوة)

These things have held up perfectly through a couple of months of constant vibration on my mill table, and the nylon patch is a lifesaver for keeping them put. The cup point digs in nicely, and the alloy steel feels solid, not brittle like some cheaper sets.

The hex socket drive made tightening these in a tight spot so much easier than using a regular screwdriver. Each screw threads smoothly and the nylon patch holds them firmly in place, even with some vibration.

I needed to lock a cam in place on a shaft and the nylon patch on these set screws kept them from backing out under vibration. The cup point bit in nicely on the metal with the hex drive making adjustments quick.