Wise 8WD013-6-710 Rotomolded Standard Helm Chair Shell with 12-18-Inch Adjustable Pedestal and Seat Slide, White Roto Molded Chair, Cushion Set, 12"-18" Adjustable Pedestal and Fore/Aft Adjustable Seat Slide Includes Wise 2-3/8" Adjustable Pedestal #8WP21-374 and Wise Seat Slide #8WD374 Classified "AD" for Drivers Position with Easy Grip Lock Handles Seat Dimensions 18.25" Height, 16" Width, 19.5" Depth, 16.5" Seat Depth 6 Year Warranty on Frame, 3 Year Warranty on Upholstery