The black plastic bearing that goes in the conrod, allowing the wheel crank to turn freely. The center of the bearing is about 3/8th of an inch in diameter. Please note, if your conrod is the newest style, with the flanged conrod bearing, this is not the correct one for your wheel.
This conrod bearing works on the middle style of Ashford wheel, with the solid crank and the leather or clear nylon con rod joint, If you have the old old style of crank (older then 30 years), with nuts and bolts, this will not work for your needs. Or if you have the newest style, with the black plastic con rod joint, then this will not work for your needs. For that you need the Universal Joint.