you can contact American Artisans in San Carlos CA - they played an integral interior design role in this particular bathroom and would have access to those specifications.

American Artisans did the architectural interior design for this bathroom and fabricated the cabinetry. Unfortunately we don't have the direct posted link to this photo so I can't see when questions are submitted about our work. We worked one on one with the homeowner to produce her dream of a "sexy guest bath." We loved these handles because of how well they work with the star fire glass we selected for the shower. The handles are glass. They are from a furniture/ cabinetry supplier called Hafele. Super "sexy" and fun... Thanks for your question and sorry for the delayed response.