My other half does lots of beading. So she needs a place to store a lot of tubes of beads. Even though we have a "craft room" theres not a lot of space for everything. I came up with the idea of a pegboard unit to put all the beads on the wall.
The pegboard needs to have holes every 25mm. Using M4 Hex nuts and M4x10 (or 12) bolts with appropriate washers allows you to fasten the racks to the peg board.
There are 3 holes / nuts in the model to allow for flexible spacing on the pegboard.