Often called "Diver's Dream," or "Diver's Plate," or DP-1, these anodes are made of galvanized steel cast into zinc and may be bolted on. SPECIFICATIONS Length: 12" Width: 6" Thickness: 1/2" Slot Width: 2-1/4" to 9" Slot Height: 1/2" Weight: at least 9 lbs. Heavier than Camp or any other plate out there, so it will last longer! Bolt plate is galvanized steel cast into zinc.  B0027EKP48