Diamond engraved ejection port dust cover - Cover engraved on inside and on outside * Fits most 223/556 rifles (will not fit 308, 22LR or 9mm) * The engraving is made using a diamond drag method which creates a beautiful "engraved" look and feel that you can actually feel with your fingertips * No harsh chemicals are used on the metal like laser engraving * Made in the USA using American made covers