The DL-AR21863 is a Digitalinx adapter ring. Make Liberty's Patented (US Pat. No. 9,784,338) Adapter Ring 2.0 part of every install. Whether setting the Adapter Ring in a ring or line format, assembly is easier than ever. Requiring one tool, connecting and disconnecting is simple and easy. This design also includes an aluminum clamp with threaded screw holes, eliminating the need for nuts.