One Inch Riser Set

They work fine to avoid pier collisions. I have an 8" pier (should have been 6"). I replaced the 2½ risers I bought previously and this improved noticeably with my precision on polar alignment and modeling.
They are SAE. My scope rings are metric. Visited local hardware store for some M6 40 mm. Also it was not exactly clear to me if the price was for the set of two as shown in the photo or price is for each one. I have two scopes, ordered two sets and got four risers not just two, so there you go.

very nice units