A.R.M.S. #22 Throw Lever 30mm Scope Rings - High height All Steel 30mm Ring, secured with A.R.M.S. dovetail system to an extruded aluminum platform. Height: 1.450" (Measured from the center of the optic to the top of the base). This Throw Lever product is made to fit the Mil-Spec 1913 Rail dimension.