The Model 506 is the flagship of our tank rack/holder line and our biggest seller. It's all aluminum and fully welded to stand the test of time, even in the harshest of environments. Our tank racks will hold any size tank with any boot attached, unlike the competition. They all have non skid non marking feet attached to preserve the deck of your boat, the feet are even attached with 316 stainless steel screws to assure that you won't be worrying about rust stains on the deck of your favorite dive boat again. So if your looking for a quality solution to your tank storage and transportation problems, give us a try.