The Deep 6 Tank Strap with Plastic Cam Buckle comes packed with features!  Just kidding, it is a tank band.... with a buckle... used to secure a tank.  Comes with no-slip padding, a plastic buckle, and is made from 2" webbing.  Secures to itself with a velcro attachment.

If you are assembling a Backplate and Wing setup, you absolutely need two if not using an STA, or if using an STA two are better, but one will work.

For sidemount divers, you must add a slider to the webbing to hold the boltsnap lanyard.