Douglas Large Plastic Insert Bushing Set of 4

This is a heavy duty insert and may not look like the insert in your chair. Be sure and follow the measurements below. There are two sizes of Douglas plastic inserts which fit inside the post of the chair base. The swivel tilt mechanism fits into the insert. Fits in the post with the inside dimension of 2 1/16". TOP OF INSERT MEASURES 2 3/8". 4 inserts included. We recommend lubricating the parts with white lithium grease prior to installation.