- OT Equator Threaded Abutments and Sleeve, all in Titanium, accessories for the OT Equator system by Rhein83. -OT Equator Titanium Threaded abutments with either 2.0mm thread or 1.6mm thread, plus 1.6mm titanium threaded sleeve. - The OT Equator from Rhein83 offers the lowest profile and least overall dimensions of any overdenture bar attachment system on the market. **For further product information, please contact Chat Support**