Overton's 5" Rubber Roller Bracket Assembly - These hot-dipped galvanized roller brackets are pre-assembled for easy installation. 17/32" x 5" slot allows vertical adjustment for proper keel support.
For a heavy boat it would be better with no slots. the consumer needs a drill to install it anyway. I first attempted to write this in the cons area because thats all that showed and was annoyed that there was not enough room