Single Tank Adapter (STA) - Stainless Steel Stainless Steel single tank adapters (STA) allow you to attach a tank using tank cam bands to your backplate, harness and wing system. Each STA comes with attaching hardware. The stainless steel STA is usually paired with a stainless steel backplate, allowing a diver to carry less weight or hold heavier tanks. 4 tank cam band slots to adjust the height and location of the bands. Distance between hole centres: 280mm (standard 11 inches). Weight: 670 grams Single Tank Adapter (STA) - Aluminium Aluminium single tank adapters (STA) allow you to attach a tank using tank cam bands to your backplate, harness and wing system. Each STA comes with attaching hardware. 4 different tank cam band settings. Light weight and great for travel or general diving. Distance between hole centres: 280mm. Weight: 275 grams + hardware.