The H Series blood drawing chairs feature a convenient hydraulic lift that is adjustable using the large pump-action foot pedal to position the patient at the perfect level. 6310 and 6330-P come with a single stationary arm and a straight flip arm, while 6320 and 6340-P come with a drawer arm and a straight flip arm. Go with either a vinyl upholstered seat for comfort, or the EZ-Clean single piece solid plastic seat for durability and better cleanability.