Dale Adams Enterprises' Tail Bone mechanic's stool features 5" diameter wheels to roll effortlessly over air hoses, drop cords and debris without tipping or flipping. The base is a uniquely designed tripod, a naturally stable work platform on uneven floors and surfaces, and the bucket seat makes it easy to use natural body movements and trunk strength to get into position. The seat and base are molded of the same polymer that's been used for the durable Bone creepers. The 12" seat height is appropriate for many workshop chores.