Wise 8WD562-7-710 Ladder Back Helm Chair with Adjustable Height Pedestal, White Ladder Back Helm Chair, Cushions with Adjustable Pedestal and Seat Mount Spider Includes Wise 2-7/8" Adjustable Pedestal #8WP21-18S and Seat Mount Spider #8WD94 Rotational Molded Seat Frame, High Compression Foam Padding, UV and Mildew Treated Marine Grade Vinyl Classified "AD" for Drivers Position with Easy Grip Lock Handles Seat Dimensions - Height: 19", Width: 17", Depth: 22", Seat Depth: 15.5"; Pedestal Dimensions: Adjustable 12" to 18"