THIS IS A NEW WILTON SWIVEL BASE. THE PART NUMBER IS 101198. THIS BASE FITS THE WILTON 745, 1750, 1755, 1760, AND 1765 TRADESMAN VISE AND THE C1 VISE THAT DOES NOT USE THE INNER RING. THE INNER DIAMETER IS APPROXIMATELY 5 5/8 INCHES AND THE RING THE VISE WOULD SIT ON IS APPROXIMATELY 7/16 INCHES WIDE. IT HAS THE HAMMERED GRAY FINISH. THANKS FOR LOOKING.