for Glock Gen 1-4 17 19 21 22 23 27 30 34 36 41 Back Plate Black NDZ Plain For Glock Gen 1-4 Model 17 19 21 22 23 24 26 27 29 30 31 32 33 34 35 36 37 39 40 41, NOT for Gen 5, 42 or 43 Rear Slide Plate Black 1000+ High Resolution Permanent Laser engraved images, will not rub off, not painted, custom engraving too - by NDZ Performance 100% Aircraft Grade T6 Billet Aluminum, Mil-spec Hardcoat Anodized Durable Finish Replaces Stock Plastic Plate with a Durable Aluminum piece, Easy Install, Requires NO Modifications Designed and Made In America, In Our Facility - In NDZ Packaging