FASTENER SIZE 1/2 INCH; FINISH/COATING PLAIN; INNER DIAMETER 9/16 INCH; INNER DIAMETER - DECIMAL .5625; INNER DIAMETER - DECIMAL - UOM IN; INNER DIAMETER - FRACTIONAL 9/16; MATERIAL CARBON STEEL; OUTER DIAMETER 1-3/8 INCH; OUTER DIAMETER - DECIMAL 1.375