The Elzetta ZRX Flashlight Mount attaches to Mil-Std 1913 Picatinny Rail Systems and provides secure, low profile attachment of a 1-inch tactical flashlight (specific diameter range is 0.94 to 1.04 inches (23.8 to 26.4 mm)). This includes all Elzetta Modular Flashlights. The ZRX uses a Combination of materials to achieve rock-solid connection with very light weight. With hard anodized aluminum clamping rings, steel hardware, and a polymer body, the ZRX Mount weighs just 1.1 oz (32 g) while providing outstanding strength and durability. Made in USA.