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#144 Whisker¨ Self-Centering Metal Knuckle Couplers - Kit - Magne-Matic¨ Short 1/4" Underset Shank w/#242 Draft Gear Boxes 2 Pair by Kadee Quality products / HO Scale All metal self centering Whisker¨ Magne-Matic¨ coupler kit. Short 1/4" underset shank with #242 draft gearboxes. 2 pair.