The machined M4 fixing screw is available as a separate item for those occasions when the standard screw supplied with a cupboard knob or cabinet handle is not long enough.
45mm Long, Snap-off
The M4 screw has a 45mm length and is a snap-off version, which means the thread is wasted at 5mm intervals to allow for easy cutting with a pair of plyers. There are other sizes available (not snap-off) and some of these can be found in the related products.