"standard" size for frag plug stems?

[Andamaite]

I am working on a DIY project for a "rockwall" and am curious what the standard stem size is for a frag plug, so that I can incorporate a few sockets into the concept.

 

[Gumbies R Us]

@SPS Freak

 

[Andamaite]

I've been doing my research on this while I've been stuck indoors. In case anyone else comes across this thread later on:

It seems MOST are somewhere around 3/8", but a few squeak over that closer to 1/2". I think I'm going to add the holes in at 1/2" and cross my fingers. Maybe have a few that are closer to 1", and a couple of "shelves", just in case I come across LR chunks, tile pieces, or flat-bottom plugs.

This project has also kind of had some feature creep, so I'll be documenting the process for the DIY forum later.

 

[DIYreefer]

I use two different sized plugs, both made by Ocean Wonders. The stems are the same size on both of them. I measured them at 5/8” long by 3/8” wide. I hope that helps!