Magnetic versions are better suited to storing a wider range of rattle cans.

Non-magnetic versions are designed to store cans no larger than 66 mm (standard size for most cans) this version also a socket screw at the back of the holder for adjusting how snugly it holds your cans. 

Note: Magnetic versions use all use 6 magnets per rack (picture may show differently, 4 magnets were fine, 6 is better)

These are sized for 50mm, but the long versions can be adjusted with an Allen key to provide a better fit on tubes that are smaller or can just be used to reach your desired level of snug. tube can be store either way up as there is a hole in the bottom to accommodate the nozzle. Short version fit cannot be adjusted but are again sized to 50mm

Please consult the pictures/variation of your selection for compatibility information. units that need mounting screws have them included. care not to over tighten them, you only need a little pressure for a good secure hold. 

As always, my stuff comes with the buy it right buy it once guarantee: something goes wrong; ill sort ya out. 

Take a look at my other items for other snazzy organizers.