Adjustability allows the installer to mount the hook over remnants of the old roof.
Batten bridge has a 9mm x 40mm slot and is 63.5mm wide. 10mm x 38mm rail slot accepts 5/16-inch or 3/8-inch bolts. Use the 1/4-inch or 5/16-inch Solar Screws in the 9mm slots.
This order comes with 20 units per case.