Mob Armor MOB-MD Cell Phone Mounting Discs, 2 Pack.
hese steel discs allow you to mount your magnetic phone mount to non-ferrous surfaces.

You can never have enough mounting discs. These steel discs allow you to mount your magnetic phone mount to non-ferrous surfaces. Give yourself more mounting options with extra hardware that will allow you to use your magnetic mount in more places securely. Two 38mm steel mounting discs are included per pack.