This unit is for large commercial pools. Heavy-duty reinforced four-inch hubs and commercial grade handle. Extra-high and with four-inch casters and a third leg for easy movement poolside. Uses Rocky's four-inch Heavy-Duty Commercial Anodized Tubing.       Senior Commercial     Pool Width      16'       18'       20'       22'       24'       26'       28'       30'      Pool Length      100'       95'       90'       85'       75'       70'       65'       65'    Senior Commercial System Installation Instructions (2pg. 174k) You will need the Adobe Acrobat Reader to view this file. Click here to download. © 2001 Rocky's Roller Systems Inc.   All rights reserved.