Listing for 1 case containing 20 sets (40 pcs) Pacific arm pads are suitable for use on many typical office chairs. The simple yet durable design insures many year of use. This style has withstood the test time and many companies still use them on new model chairs. These chair replacement arm pads should fit all styles of arm bracket with 4" center to center mounting hole pattern. mounting screws are included. If interested in 3 or more case, we offer volume and combined shipping discount.