In set of two rings.
Upper side with 1/4"-20 thread hole.
Lower side with M6 thread hole for dovetail rails, mounting bolts and washers included.
Tube rings are powder-coated black.
cast-aluminum tube ring set features quick-release, hinged clamp knobs and felt lining, allows you to securely attach a telescope optical tube to a mount and tripod.
The hinges open to allow easy installation of the optical tube and the locks can be loosened during use to allow tube Rotation and balancing.
In order for astrophotography lovers to capture the spectacular views of the sky, one of the two rings in the set has a 1/4"-20 piggyback camera adapter on it, the other has a threaded 1/4"-20 hole.
The piggyback camera adapter can be removed for mounting an adapter plate for a guide scope on top of the tube rings.
Pls choose the size that matches the outside diameter of your telescope tube.