These are bolt-on axle shafts for aluminum main landing gear.
Includes: Two axles and two nuts
Axle Length: 2 (what the wheel turns on)
Axle Diameter: 3/16 (what the wheel turns on)
Threaded Mounting Portion Width: 5/16
Overall Length: 2-7/16 (entire length)
Inner Diameter: 5/16
Outer Diameter: 1/2