Product review (5 stars): an excellent product.
The sticky surface has an iron grip once it's set in place.  The holes are big enough to accomodate a regular size padlock.  I had bought one set for the refrigerator door and another set for the freezer door.  I only wish I could have placed them close enough to allow for 1 padlock to be used for both sets.  The handles didn't allow for that, but nonetheless, an excellent product.