Due to its ease of portability, the I.D. Ring Holder is a great alternative to bulkier and more expensive choices. This ring holder is a good economical option when users need a simple, functional, and quality workholding solution. For use with any GRS block or vise. This I.D .Ring Holder is not compatible with GRS BenchMate; see the Stone Setter's Package for either BenchMate Encore for a compatible I.D. Ring Holder fixture.