有頭螺絲，M4x8 內六角沉頭

These little M4x8s seat flush perfectly in the counterbore, which is exactly what I needed for a clean fit on my mill table. For the price, the socket head takes an Allen key without stripping, and they’ve held up fine so far.

Finally found a countersunk M4 that actually sits flush in my mill's table slots without needing to be filed down. The 8mm length is perfect for securing clamps without bottoming out.

The hex socket engages the Allen key securely without stripping, and the threads cut cleanly into the aluminum block I was working on. These M4x8 screws hold tight without backing out, exactly what I needed for a steady repair.