Binder design Says
Sized to fit all common manufactured sizes of rocketry airframes.
Tested with Performance Rocketry filament wound and convolute tubing, as well as Hawk Mountain filament wound tubing.
That being said this set is very tight fit on 2.250 OD tubing, that is the size they were used on, may be better fit on a 2.225-2.240 OD tube, that is a my guess .
Hope this helps