Jaw Coupling Hub; 7/8" Bore; 2-1/4" Hub Dia; Jaw Coupling; Hub; Shaft; Finished Bore; Keyway; 2.9" Outside Diameter; 1.1" Length Thru Bore; 200 Size or Series; Set Screw; Magnesium Alloy; 1800 Maximum Speed; Neoprene 398.3 | Urethane 597.4 | Hytrel 1194.9In-Lbs Torque