M10 threading. comes with aluminum washer to broaden base of support for flat bottom tripods, cw shaft and cw $220 plus shipping (g11 saddle plate not included. some set screw marks on cw shaft, but otherwise everthing is in very nice condition. discoloration in picture is only grease.
saddle plate sold.
this has been a great mount for me until i went to a long focus refractor. thanks for looking.