Titanium Mag Scoop
The titanium mag scoop is a very handy little tool which features a nice sized scoop on one end, ideal for loading up a bowl. On the the other end is a flat tamper which also houses a magnet.
Diameter of scoop is 18.8mm. This does not necessarily need to be able to fit right into a herb chamber for it to be useful. You can basically shovel in some herb then tamp it down with the flat end.