Wise Rotomolded Deluxe Helm Chair with Seat Slide, White Roto Molded Chair, Cushion Set and Wise Seat Slide 8WD374 Includes Wise Seat Slide #8WD374 Fits 2-3/8" OD Diameter Pedestal Classified "AD" for Drivers Position with Easy Grip Lock Handles Seat Dimensions 18.25" Height, 17.75" Width, 22.5" Depth, 17" Seat Depth 6 Year Warranty on Frame, 3 Year Warranty on Upholstery