旋鈕，主軸鎖定，檯式銑床

Fits perfectly on the SIEG SX3.5 and locks the spindle solid with no play. The knurled grip gives you a good purchase even with slightly greasy hands. Exactly what I needed to replace a stripped original.

The knurled grip gives me a solid purchase even with slightly greasy fingers, and it threads on smoothly without any wobble. Swapping out the old loose knob made locking the spindle feel much more positive on my SX3.5. Exactly what I needed.

The black knob fits my SX2.7L perfectly and the grip is solid—no slipping when I lock the spindle down for a collet change. Feels like a proper machined part, not some plastic afterthought.