Floor track 23-242 description question

A home owner from Ohio says:
March 5, 2015
The description for floor track #23-242 states that it accomodates convex rollers. I believe this is wrong and want to make sure you made a mistake before I buy the 72" satin nickel one. Please verify.
Thanks
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Dave Sr. from SWISCO responded:
March 6, 2015
This description is correct. The rails on the 23-242 are recessed, requiring convex rollers. The rails do not stick out for concave rollers to ride on. For clarification, see the following video.
72" Sliding Mirror Door Bottom Track
72" Sliding Mirror Door Bottom Track
23-242
$25.97
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