I like the design of this creeper, as you can approach this seat from any angle and sit on it. Though the comfort isn't as nice as "The King's," it does have its advantages if you are constantly getting on and off of it. Great for those tedious projects. Raise or lower the height pneumatically from 17 1/2" to 21 1/2". Large 2 1/2" casters easily handle rough surfaces. The steel tray stores tools and keeps things within easy reach. Large, comfortably padded, 14 1/2" diameter seat.