These couplings have simpler designs that sandwich a rubber buffer (nitrile rubber) between two hubs. The hub is lightweight, being manufactured from aluminum alloy. The uncomplicated construction sandwiches a spider (rubber buffer) between hubs, so the coupling is well fixed or removed by way of moving the system within the axial direction. Mounting on a shaft is easy. Simply hold a straight-edge to the hub outer edge to middle it.One supply of charm is that its straight forward construction potential decrease cost. Application Pumps/Fans/Textile machinery