This adapter is designed to attach the Arisaka Rail Slider onto multiple ball heads" enabling your tripod to Make Picatinny Great Again. The dual slot arrangement allows for a precise fit on many different brand ball heads" including Leupold" Vortex" Two Vets" and RRS. Please note: The new RRS R-Mount ball heads require the RRS rosette adapter" part number RRS-9000001" in order to function with the Arisaka Rail Slider adapter. Legacy RRS ball heads fit without the RRS rosette adapter.