Streamlined, strong and durable, the Pro Rings use four T-15 Torx style socket cap screws for secure mounting of your riflescope. Unique design permits easy installation and removal of the scope into/out of the rings. The rings will clamp to either a Picatinny or Weaver rail using the integrated crossbolt. Square-edged crossbolt ensures positive engagement of ring to base Durable black matte anodized finish Precision CNC machined 6061-T6 aluminum alloy Made in the USA Available Vortex Pro 1-inch Rings MPN Height Optical Centerline VPR-1L Low .78" VPR-1M Medium .88" VPR-1H High 1.03" Learn More About Vortex Pro Series Rings Vortex Viper 1-Inch Rings (Set of 2) High (1.03 Inch / 26.16 mm) VPR-1H