This rail converts your 11 mm dovetail into a standard 1911 picatinny rail.
Very easy to install by tilting the picatinny rail at an angle and sliding onto the rear dovetail section. As you move the rail rearwards reduce the angle so the forward section of the picatinny rail engages with the front dovetail. Five side mounted screws provide a secure attachment and avoid the issues associated with vertically mounted screws.
Altogether an elegant and effective way of giving you more optic options on your CZ 455 rifle!
Allen wrench included.