GOLDGALV. FINISH; 9/16 INCH INNER DIAMETER; 2 INCH OUTER DIAMETER; .5625 INNER DIAMETER - DECIMAL; 2 OUTER DIAMETER - DECIMAL; 9/16 INNER DIAMETER - FRACTIONAL; 2 OUTER DIAMETER - FRACTIONAL; 1/2 INCH FASTENER SIZE; SUPERSTRUT. BRAND