With a thread on one end of the adaptor suitable for connection with a rebar coupler and a thread at the other end of the adapter for connection with the cone for the purpose of creating a cavity to allow another threaded rebar to be inserted and coupled after concreting...
The threaded end which connects with the spacer cone is a standard size to suit any size cone. The threaded end that connects with the coupler is manufactured to suit the size and type of coupler being used.