Wise 8WD007-6-710 Deluxe Pilot Helm Chair & Pedestal Combo features Wise 8WP21-374 ABYC Class AD Driver, 12 to 18" Adjustable Height Pedestal with Seat Slide; Includes Wise WD399 pedestal mounting plate; Compact design provides comfortable seating ideal for small to medium size adults, youth and children Roto-molded, high impact marine grade plastic external frame, includes a pre-mounted universal pedestal mounting plate with T-Nut inserts to fit standard seat mount or seat slider pedestal; Narrow inside width dimension provides a secure and comfortable seating experience Snap-on cushions and arm rest pads with compression foam padding and mesh underlay to expel moisture; Heavy Duty Marine Grade 28 oz. vinyl withstands the effects of sun, heat, rain and soiling under normal conditions; features heavy duty welting and embossed vinyl surface detail Pedestal is constructed of extruded and cast polished aluminum, with a thick walled, 2 7/8" polished anodized aluminum post; Adjustable from 12" to 18" in height; Fore & aft slide mount adjustment allows for 5" of seat travel; Cast aluminum seat mount locks and swivels 360 degrees with adjustment knob; 9" diameter base with recessed mounting holes SEAT and PEDESTAL COMBO DIMENSIONS - Seat Height: 23.5", Width: 25", Depth: 26.25", Sitting Depth: 16", Sitting Width: 15"; Overall Height with Pedestal: 35.5" to 41.5"