These factory original, drop-free magazines fit your Glock double-stack 9mm pistol, for instance, the Glock 17, 19, and 26. Fits all generations. Should work with any aftermarket firearms that use Glock pattern double-stack 9mm magazines as well. These Glock magazines have a hardened steel insert encased in a high-tech polymer. This polymer coating protects the magazine and prevents deformation, even when dropped from a great height.