NDZ Performance Glock Gen 1-5 Post 98 SAF-T-Blok Right Handed Trigger Saftey Block Masonic Square Compass Keep a round in the chamber while keeping your gun safe! Installs behind the trigger quickly and easily Prevents accidental discharge and "gun snatch" situations 1000+ High Resolution Permanent Laser engraved images, will not rub off, not painted, custom engraving too - by NDZ Performance