The xs scuba tank holder features a rugged, double slotted base made of durable, impact-resistant plastic. The adjustable-length silicone bands are user replaceable. They feature a durable, corrosion-resistant stainless steel hook. Simply stretch and latch to easily snap your tanks in place. The bands can be fastened to either side of the mount thanks to the reversible tank holder design. You can mount the base directly to your wall, truck, or boat with the 6 included mounting screws. Or youbine the tank holder with the aluminum tank rail for a removable tank system. Slide up to 3 tank holders on or off the 36″ aluminum rail as needed — no hardware required. This is a great space saver on pickup trucks or small boats. Easy to use — just stretch and latch corrosion resistant stainless steel buckle user-replaceable surgical-grade silicone tubing corrosion-proof, durable, impact-resistant plastic base interlocking base so you can connect an infinite number of tanks mount tanks in either direction with the reversible design includes 6 screws to mount the tank holder directly to any hard surface combine with the aluminum tank rail for a secure, convenient, removable storage system secure tanks with adjustable-length bands ideal for holding 7.25in / 184mm diameter scuba tanks also capable of holding 6.9in / 175mm tanks and 8.0in / 203mm tanks use the extender kit to secure a tank with bcd attached