Safco Products 6689BL Adjustable T-Pad Arm Set for use with Apprentice II Extended Height Chair, sold separately, Black Apprentice adjustable T-Pad arm set Adjustability height 10 to 12 1/4"H Adjustability width 4 1/8"W For use with Safco Product Apprentice II Models 7083BL and 7084BV, sold separately