I wonder if they're for something like attaching countertops to the top of kitchen cabinets...Approx 40mm dia & 40 long.
They are like the things used to fit curtain poles but I bought them from a sale where most of the stuff was for fitted kitchens & plumbing.
Maybe something along those lines though, a towel rail or something.
It’s lots more of those things that you keep for ages and only need a week after you throw them away.knows exactly what they are.
It’s lots more of those things that you keep for ages and only need a week after you throw them away.

Kerox KDZ 35 On/Off Flow Cartridge
Kerox KDZ 35 On/Off Flow Cartridge (KDZ35)Kerox KDZ 35 Technical Information Total Height: 58.www.divapor.com

