Rolex Midsize Jubilee Bands: 17824, 68240, 68274, 78240, 78274, 78246, 78266, 78286, 68159, 78159, 78279. 13MM STEEL JUBILEE WATCH PART LINK COMPATIBLE FOR ROLEX MIDSIZE 31MM DATEJUST WATCH. It is specifically designed for Rolex Midsize or Junior 31mm Jubilee watch bands with 17mm lugs.
eBay