March Scopes Middle Focus Wheels 31mm Black. These all-metal shades reduce stray light as well as decreasing barrel flare and ghosting off the target. Specifications for March Scopes Middle Focus Wheels: Manufacturer: March Scopes Color: Black Finish: Type 3 Hard Coat Anodizing Fabric/Material: 7075 Aluminum Fit: Universal Gun Type: Rifle Gun Make: Universal Gun Model: Universal Condition: New Outer Diameter: 49 mm Country of Origin: Japan Package Contents: March Scopes Middle Focus Wheels March Scopes 2-DB340-0: Middle Focus Wheels 31mm Black