This wheel is from a handtruck.
These are the important measurements to know:
The hole at the center is slightly more than 5/8" diameter.
The center is 1 3/4" wide. So, your axel must have about 2" for this wheel, the washers that are on each side of the wheel, and what holds all three on the axel.
This wheel is 8" in diameter. Make sure there is more than 4" from the axel to whatever the wheel may touch, so it will spin.
Additional information:
The black rubber is solid, not hollow.
The gray part of the wheel is metal, but is not steel. (A magnet does not stick to it.)
This gray metal is 1/4" thick.
The center has contained ball-bearings.
This wheel is used, but in very good, solid condition.
There are no cracks or breaks in it.
I only have this one.