Platform Mt. Seat, Weather Resistant Vinyl Weather Resistant Platform Mount Seat Part No. B6180 Heavy duty black vinyl trim Medium height back for rear/side visibility 900mm (35.43") + headrest = 1085mm (42.7") from floor Swing up arm rests with angle adjustment. Heavy duty suspension Backrest tilt - 70° forward & 70° back 50kg - 130kg (110lbs - 286lbs) suspension adjustment 175mm (7") slide adjustment Height adjustable removeable headrest Seat Belt Included 3 Height Settings: 275 - 300 - 335mm  (10.8" - 11.8" - 13.2") Mechanical Spring Loaded Ratchet System