Safco Products 3591BL Adjustable T-Pad Arm Set for use with Optimus Big & Tall Chairs, sold separately, Black Optimus big and tall T-Pad arm set Height adjusts 3", top of arm rest is 6 1/4 to 9 1/4 above seat At lowest seat height, top of armrest adjusts 24 1/2" to 27 1/2" from floor Width adjusts 2", width between armrests 24 to 28 For use with Safco Products Optimus big and tall chair Models 3590 and 3592, sold separately