Made for flashlights with standard one-inch (1”) bodies and will accommodate a range from .94 to 1.04 inches. The Elzetta ZRX Clamping Rings are made from micro-textured Mil-Spec Type III Hard Anodized Aluminum. The body is a glass-reinforced polymer with steel hardware. Extremely light and only weighing 1.1 oz. It is designed to fit along Mil Std 1913 Picatinny Rail. The mount is 1 3/8” wide covering 3 bars and 2 slots of a Picatinny Rail. It is versatile and accommodates many popular flashlight bodies that range from .94 to 1.04 inches.