Fits 9mm, 40S&W, 357SIG, and 45GAP(sub-compact, compact and full size) models only. Will not fit .45 ACP models, or XDM frames. These units replace the magazine base plate. They do not alter the capacity of the magazine and provide better comfort by adding approximately 5/8 inch of gripping surface. These units blend with the contours and texture of the handgun and have a factory appearance. They are made from High Impact Polymer and withstand drop tests at temperatures from -20 F to 350 F. They provide control and comfort without sacrificing conceal ability.