I received a pack of black and white without noticing white 12mm and black 13mm. The black 13mm snaps nicely into the chair rails, but is loose and rotates. To fix this I put 1"L x 1/4" x 1/2"W of caulk in each piece and then snapped it onto the rail with the sticky side facing the rail. The foam strip is stuck and will move not...to say they will stick/stick a bit over time, but without gluing it's easy to fix!The white 12mm is for a 1/2" round steel garden furniture base. They fit a lot better and may be because they are 12mm or have enough curvature to improve the friction fit.
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