Features: 1. Excellent quality, it will not rust like metal, even in a humid bathroom. 2. Internal locking structure, movable inner ring, good load-bearing capacity, good toughness and durability. 3. The Roman silencer ring slides easily and smoothly. The ring has good elasticity and is not easy to break. Specifications: Color: Silver Material: ABS Inner diameter: approx. 1-9/16 inch (40 mm). Outer diameter: approx. 2-3/4 inch (74 mm). Suitable for rods up to 35 mm in diameter. Package Included: 20 curtain grommets, inner diameter 40 mm (1.6 inch).