Specifications ? Ring Style 1: Double Screws - Thick - High Profile - 0.82 Inch - 2 Pcs ? Ring Style 2: Double Screws - Thick - Medium Profile - 0.55 Inch - 2 Pcs ? Ring Style 3: Single Screw - Thin - High Profile - 0.8 Inch - 2 Pcs ? Ring Style 4: Single Screw - Thin - Low Profile - 0.47 Inch - 2 Pcs ? Material: Aluminum Alloy ? Ring Diameter: 1 Inch ? Rail Type: 11mm Dovetail Rails Package List ? 2 x 1'' High Profile Double Screws Thick Dovetail Scope Rings (Optional) ? 2 x 1'' Medium Profile Double Screws Thick Dovetail Scope Rings (Optional) ? 2 x 1'' High Profile Single Screw Thin Dovetail Scope Rings (Optional) ? 2 x 1'' Low Profile Single Screw Thin Dovetail Scope Rings (Optional) ? 1 x Allen Wrench ? 1 x Spare Screw NOTE: Please choose the style you need before purchasing.