Rear Left Compressed Length 23 1/8, Inboard Splines 39T, Inboard Spline Diameter 2 11/16, Outboard Splines 27T, Outboard Spline Diameter 2 3/4, Shaft Diameter 13/16, Thread Measurement M24X1.5; Self-locking nuts that match the grooves on the threads and lock when tightened to the specified position. The locking effect is the same as using a pin