Jaw Coupling Hub; 7/8" Bore; 2.9" Hub Dia; Jaw Coupling; Hub; Shaft; Finished Bore; Keyway; 3.45" Outside Diameter; 1.3" Length Thru Bore; 300 Size or Series; Set Screw; Magnesium Alloy; 1800 Maximum Speed; Neoprene 701.4 | Urethane 1052.1 | Hytrel 2104.2In-Lbs Torque