Hi are you interested in my aero bars?
Good Morning!  That is a nice set you have.  I am interested but I have a question
Go ahead and ask away!
My bike has 30.5 handle bars.  In the chance that they do not fit, would you accept a return?
Definitely!  Who wants a product they cannot use right?! Price is 30, do you want them?
I do like them but would you accept 28?