Round Adjustable Seat (GRSRB) - by Whiteside Manufacturing<div style="text-align: left;"><strong>[Product Information]</strong><br><ul><li>Seat pad is 12 inch with durable vinyl covering that can be cleaned easily</li><li>Steel cast collars at the base of the seat and base of the cylinder add strength to the unit</li><li>The gas filled cylinder adjusts from 16 inch to 20.5 inch in height</li><li>Seat has five 2-1/2 inch oil-resistant rollers</li><li>Ground clearance: 2-1/2 inch</li></ul></div><img src="http://ecx.images-amazon.com/images/I/41GVRaqqw6L.jpg" noproxy>