Outside dimension of hub liner should be same as inside of where the liner is inserted.Insertion tool can be rented.
Very common Office chair base hub liner1 3/16" (1.1875") outside diameter3 3/4" highHas 1" inside diameter center holeWhite
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Office chair Hub liner-plastic1 3/16" outside diameter1" inside diameter center hole
Hub Liner Removal & InstallationHub Liner Removal & Instal ToolHub Liner Tips