Dodge Raptor Coupling Hub, Tire Finished Bore, E3 Coupling, 1-1/4 in Bore Dia, 2 in Hub Dia, 7500 rpm Maximum, 1-1/2 in Length Through Bore Suited for any application, hubs are reversible to accommodate a wide range of shaft gapsInterchangeable hubs are used for both close-coupled and spacer designs for reduced inventorySet screw locking mechanism ensures a quick, easy installationTwo set screws at a 65 deg angle optimizes radial and torsional holding power, resulting in a 75% holding power increase versus competitive designs using one set screw