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.
35mm Long
The M4 screw has a 35mm length. It is also available in different sizes and snap-off versions (which means the thread is wasted at 5mm intervals to allow for easy cutting with a pair of plyers) and some of these can be found in the related products.