This glue-on base pad increases your stock magazines' length by .360" to provide positive seating without getting too long for practical use. 3 pack Compatible with all welded base 1911 mil-spec magazines Applied with a thin film of quality contact cement to the bottom surface Installation Instructions: Roughen and degrease all contact surfaces of base pad prior to gluing Apply a thin film of quality contact cement to both surfaces Let dry, them firmly press the base pad onto the magazine