Select from sizes in options menu to the right.  Size references the tube OD related to your project.
 
All sizes offer the following features.
 
304SS material.
No crown nut to strip t-bolt threads during multiple installs
Full ID slip design for quick mock up and weld process during exhuast assembly
Concentric mating halves for easy alignment during fabrication and install.  
.5" protruding edge on each vband to keep weld path heat away from the vband apex to prevent distortion post weld