The package includes: (5 different sizes:) 7.8.9.10.11mm. 3 pairs of each size. Product shape: U-shaped.Reminder: Before purchasing, please find out whether the size indicated in the description on the detail page or the size drawing of the displayed picture is the size you need. (The product size is consistent with the description size)<br><br>If there is a slight movement after installation, you can use glue to bond it.