Wise 8WD2002 King Pin Power Rise Pedestal, Adjustable 22.5 to 29.8-Inch Adjustable Height To Be Used As A Seat Or Leaning Post Rotates 360 Degrees, Adjusts From 22.5 in. to 29.8 in. Integrated Seat Mount and Height Adjustment Lever Use with King Pin Type Pedestal Base, 3/4&quot; Diameter Adjustable from 22.5 in. to 29.8 in.