- This auction is for a new LAYTON INDUSTRIES , MARK VI , WONDER BAR , marine hull grounding plate for electronics and hull metal objects , Unit measures 18 " x 6 " x 1/2 " , Mounts near the keel of the boat according to the instructions , BOX IS WORN , due to poor storage , absolutely no material defect to note , I will probably repack for shipping . Check out my E-bay store , by clicking on the red icon by my name , I am listing lots of new and used marine gear for the next couple of months . EBAY has set up a great "google style " search for the in store merchandise so it's easier to access my stock . Thanks for looking . Buy with confidence .