ProMag PM050 Floor Plate 9mm Luger/40 S&W, Compatible w/Glock Magazines, Black Polymer 2 Per Pack

Pro Mag floor plates add two additional rounds to Glock 9mm magazines and one additional round to the 40 S&W magazines. They provide an additional gripping surface for more positive control of the pistol. This 2-pack can convert two magazines with no permanent modification required.