Precision Reflex 34mm Steel Rings Heavy Duty Standard Black. Caps held in place by (4) #8-40 Torx Head Top Screws Designed to with stand large recoil. Rings Designed to mount on Standard Dovetail or Picatinny Style Rails. Specifications for Precision Reflex 34mm Steel Rings: Manufacturer: Precision Reflex Finish: Nitrite Tube Diameter: 34 mm Ring Quantity: Pair Fabric/Material: 1141 Steel Color: Black Mount Type: Rail Package Contents: Precision Reflex 34mm Steel Rings Precision Reflex 01-034-05: 34mm Steel Rings Heavy Duty Standard Black