The Elzetta ZRX is made for flashlights with standard one-inch (1") bodies and will accommodate a range from 0.94 to 1.04 inches (23.8 to 26.4 mm). The clamping rings are made from micro-textured Mil-Spec Type III Hard Anodized aluminum with subdued black-on-black engraving.  The body is a lightweight glass-reinforced polymer.  Hardware is steel.
All Elzetta products, including the ZRX, are designed, engineered, and manufactured in the USA using American materials, tooling, and labor.
 
Ring size: .94” – 1.04”
Weight: 1.1oz
Width: 1 3/8" (covers 3 bars and 2 slots of a Picatinny Rail.)