Reddit reviews Glass Funnel 100mm, Joint 24/40

Those.... don't look like powder funnels. The "drip tip" is the red flag; none of those are going to have particularly wide stems and the long stem is just going to get clogged with powder.

If you're on a budget I'd look for a plastic funnel with a stem OD <24 mm like this one or this one. If you're willing to fork over a little more cash and get a glass one there are nice 24/40 joint funnels like this small one or this huge one.

Well I didn't intend to use it strictly as a powder funnel if at all, so my question remains, what size would the the most similar to this one, mentioned previously?