The 29 1/2 Inch Complete Chair Swivel Base features everything pictured including casters, legs and swivel mechanism. The height on this mechanism is adjusted manually by spinning the seat. It is not hydraulic. Heavy duty casters and quality materials ensure this swivel chair base will last for years.
Adjustable height: 11 1/2" - 14 1/2"
Manual Height Adjustment (spin Seat To Adjust)