Height Adjustable Office Chair Armrest w/ Arm Pads (Pair) S4761-K - Replacement Arms Height adjustable folding / fold-away chair armrest with arm pads Push button on side of arm for vertial adjustment - 2.75" of vertical height adjustment range Push button on bottom side of arm post to fold arm down / rearward Bottom bracket mounts to underside of chair seats that have a matching mounting hole pattern - **Note: These arms will not mount to all seats - please check your mounting hole pattern before ordering. *** Mounting screw hardware for mounting to seat not included Bottom bracket mounting holes are slots - See pictures for mounting hole pattern dimensions