These are the budget end of the brass cabinet knobs. They are hollow, none the less they are all brass, lacquered and very useful.
VR236
PB
19mm
$1.85
VR236
PB
25mm
$2.20
VR236
PB
32mm
$2.95
VR236
PB
35mm
$3.60
VR236
PB
50mm
$5.00
$ Australian
Other suggestions:
MP3002
MP3001