To fit "On30 / Oe / O-16.5" scale Non-Polarized Magnetic Coupling, 6 Pairs Contains - 6 pair MAGNETICCOUPLINGS Non-polarized with Base for 25mm gap between buffer beams. Complete with a split cotter 12-off and No.2 x 6.5 mm self tapping screw 24-off.. There is no A & Bend these couplings will work either way round that you place your rollingstock / locos guaranteed mating no fuss. Price includes postage.