Replacement Office Chair Armrest Arm Pads (Set of 2) S2724-3 4" Wide x 10" Long Mounting screw holes are 4" (100mm) apart 1/4-20 threaded mounting screw holes (hardware not included) Cut-out area on underside of arm pad for mounting fixed or adjustable arms measures 5 3/4" long x 1 3/4" wide Universal - left or right side (both are the same) - Sold as a pair - Set of 2