Safco Products 3399BL Adjustable Width Arm Set for use with Alday 3391, Vue 3394 and 3397 Chairs (sold separately), Black Vue and Alday task swivel chair T-Pad arm set Height adjustable 2 3/4"H Width adjustable 1 1/4"W For use with Safco Products Alday 24/7 Chair Model 3391 and Vue Intensive-Use Chair Model 3397, sold separately