Yet another caulk (silicone) tube holder

I designed this to hold tubes of caulk upright in my cabinet, as they kept falling over and rolling everywhere.  I found a few other designs out there, but not one that fit my needs.  This will hold 8 tubes of any 50mm product, such as caulk, silicone, construction adhesive, etc.

I made the openings slightly oversized to accommodate damaged cardboard tubes.