Inserts are only measured by
OUTSIDE DIAMETER
of the pipe they go into

All inserts have a 1" spindle hole

**Wall thickness of your particular steel pipe may cause insert to not fit.

***We cannot guarantee all measurements will be correct for your particular pipe dimension or pipe wall thickness.

Inserts which do not fit despite correct measurement, can be made smaller with a file or grinding. Inserts that are tight can be boiled in hot water for several minutes to make more pliable.

Measure the Outside Diameter (width) of the upright steel pipe located at the center of the chair leg base connecting the 4 legs to the chair seat as shown at arrow.