JR39 Arm frames with RP50 Mobility Armpads. 2-way adjustable width/height. Forward-slanting T-arms with ergonomic, maximum-mobility arm top (extra-wide and flat pad; 2” lateral, forward and back, and diagonal adjustability). Adjustable height range of 4.25”. Adjustable width range of 1.75” each side. 7 year limited warranty on the arm frames and 2 years limited warranty on the arm pads*.