TASTER PACK OO/HO HORNBY MAGNETIC COUPLINGS Non-polarized. Standard gap between rolling stock 1 pair PIVOTING and 1 pair NON PIVOTING to replace the screw on Hornby coupling. THESE ARE NOT SUITABLE FOR RIVET ON COUPLING TYPE. OO/HO DAPOL MAGNETIC PIVOTING COUPLINGS Non-polarized Standard gap between rolling stock 1 pair PIVOTING and 1 pair NON PIVOTING to replace the Dapol hook coupling. There is no A & B end will work which ever way round you place your rolling stock / locos, mating with no fuss.