Pachmayr Grip Extenders will greatly increase your control and shooting comfort when added to popular compact and sub-compact handguns. The extensions perfectly match the shape and texture of the handgun so they look like they are part of the pistol rather than an add-on. Extenders are easy to install and are made of tough high strength polymer that stands up to the roughest handling. This model is compatible with Glock G26/27/33/39. It converts G26 to 12 rounds G27/33 to 10 rounds G39 to 7 rounds.