3/4 OD 1/4 Bore A Diameter Ruland FSR12-4-4-A Set Screw Beam Coupling Inch 1/4 Bore B Diameter 41 lb-in Nominal Torque 1/4 Bore A Diameter 1/4 Bore B Diameter 3/4 OD 1-1/4 Length Ruland Manufacturing B002SJVHM6 Polished Aluminum 1-1/4 Length 