Nearly a pound and a half of precision brass.

Dovetailed on reverse to be fitted to a mount. Centimeter scale on left side, in harder alloy. Bubble level.

The raised dial is graduated in 5760 divisions. Converted to degrees, each division is .0625 degrees. The tangent of that figure is .0010908, so at, say, 1000 yards, each division represents a difference of 1.09 yards, or 1 meter.