How to select the centroid of rebar

hi all,I want to put some sleeves on rebar,but I can’t select any point of rebar.
Could u please tell me how to select the centroid point(or start point,end point )of a vertical rebar?

(not using bouding box)

we can select start point of other element,but can’t select any point of rebar?
could anybody tell me y?

Have you tried this approach:

@598773623 I think the centerline curve method mentioned by Dimitar above is available in a package called “BIM4Struc.Rebar” by @Dieter_Vermeulen

@598773623 @Einar_Raknes Yes, in the BIM4Struc.Rebar package there is node called Rebar.GetCenterline, which returns the sketch curve of a selected set of rebar.

@Einar_Raknes @Dimitar_Venkov @Dieter_Vermeulen Thank u very much!