PRI 1 inch standard height are constructed of T6 6061 aluminum rings with hard coat black anodized finish, (4) #6-32 x .3125" top torx screws, 1/2 clamp nut, from bottom of scope to base is .320 Weight 3.9 ounces.  Scope rings from center line of the ring to the base is .82" or 20.82mm.  

Using the INCH POUND torque wrench, tighten the screws to 15 to 18 INCH POUNDS moving from one screw to the screw in the opposite corner. If you are using the standard wrench, tighten the screws by moving the wrench 90 degrees maximum and proceeding from one corner to the opposite corner.

The ring nuts may now be tightened with a torque wrench to 60 to 65 INCH POUNDS of torque or with a standard ½ “ wrench tighten an additional 90 degrees maximum.