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25.4mm or 30mm Rifle Scopes mount,Double ring，with Angle Degree Indicator and Bubble level

The red needle moves with your rifle and displays a number that indicates the percent your rifle is off level.
Multiply the indicated percent by the target distance to easily calculate the adjusted distance for gravity.
This precision-machined, aircraft-grade aluminum Angle Degree/Cosine Indicator (ADI/ACI) takes the guesswork out of uphill and downhill shots.
This ADI/ACI is calibrated in degrees and cosines give you an instant read out which can enter directly into ballistic software program on your pocket PC.

Material:6063 aluminum 
Finish & Coating: Anodic oxidation 
Color: Black 
Length :139mm 
Width: 54mm 
Center height: 36mm 
Weight: 252g 
Impact :800G Ten thousand times 
Diameter :25.4mm-30mm 
Rail :21.2mm 
Clamping way :Common dismantling 
Accessories: 
Wrench x1
Box x1