Stool Cylinder A-dec® Assistant Stool Cylinder, 45mm Dia. (A-dec #65.0209.00) 22.5” Fully Extended, 7.5” Travel A-dec® is a registered trademark of A-dec, Inc. DCI has no affiliation with A-dec and A-dec has not authorized DCI replacement parts to be used on or in connection with A-dec® products.