The ProMag polymer magazine loader is designed to load double stack Glock magazines in 9mm Luger and 40 S&W. Constructed of mil-spec injection molded polymer. Will fit magazines with top dimensions of 1-5/16" by 1" and smaller. DISCLAIMER: This product is not manufactured, authorized, endorsed, or warranted by GLOCK. GLOCK does not warrant or represent that this product is compatible with GLOCK pistols.