' Coupling Nut Reducer, Nut Style Coupling Nut, System of Measurement Inch, Basic Material Steel, Fastener Finish Zinc Chromate, Fastener Thread Direction Right Hand, Dia./Thread Size 3/8 In.-16 and 5/16 In.-18, Length 1 In., Fastener Thread Type UNC, Width Across Flats 1/2 In., Package Quantity 10 '