Glock Gen 1-3 Grip Frame Slug Plug AL1 Silver NDZ - Choose Your Design NDZ Billet Aluminum Grip Plug for GEN 1-3 GLOCK 17 19 20 21 22 23 24 25 31 32 34 35 37 38 - WILL NOT FIT SHORT FRAME 1000+ High Resolution Permanent Laser engraved images, will not rub off, not painted, custom engraving too - by NDZ Performance Fits flush, prevents snagging, debris from entering or reaching trigger assembly and firing pin Quick install and easy removal, uses spring plunger assembly for retention 100% Aluminum - NOT plastic. Also helps guide mag. into magazine well