These are the two tumblers, small one is, as you say, 10mm, the larger one is 17 and a bit MM. The smaller one will throw charges up to around the 40gn mark, and the larger one is for, obviously, larger charges.
I have spares of both large and small tumblers, along with the plungers, 2 of each, so if you are missing some parts to make it a complete set, let me know and Ill send em off for you. I have two RCBS powder throwers set up one large tumbler and one small so I don't have to piss around changing them around when loading bigger loads.
The larger holed tumbler will do smaller charges, but not as accurately, but you can use it if you are check weighing your loads on scales.
Hope this helps you a bit.
