Lovejoy Shaft Locking Devices expand to fill the gap between the shaft and hub, allowing for easy installation and removal, saving time over traditional interference fit techniques. The contact pressures created using a Shaft Locking Device can be greater than traditional interference fit pressures, allowing for more torque to be transmitted or shorter hubs to be used. The easy installation also allows the hub to be positioned more accurately on the shaft, and can facilitate angular timing of the hub. Internal Shaft Locking Device Heavy duty Very high torque Self-centering Exceptional concentricity Item Weight 0.16 ounces Manufacturer Lovejoy Item model number 69790498003 Package Dimensions 8 x 8 x 4.75 inches