A universal joint attaches to each control yoke shaft behind the instrument panel. Slack or roughness in control yoke motion commonly indicates excess universal joint wear or corrosion that may necessitate replacement. Includes protective sleeve.
The factory part had the AN3 holes about 1/32 farther apart, so a washer in the washer stack that makes the yoke not click when you push and pull (sets the clearance) had to be replaced with a thinner one for it all to fit. I recommend having/buying some 1/2 inch aircraft washers if you buy this. This was on a 172G from 1966.
Yes, Cessna 210 serial numbers 57001 through 57575 are eligible. Also, 210A serials 21057576 through 21057840.
The weight is approximately 0.12 lbs.