Aluminum construction and fits 25.4mm/30mm diameter scope install on 20MM picatinny rails.
Size: approx.135 x 45 x 62mm (lxwxh), ring inner diameter (without insert): 30mm, ring inner diameter (with insert): 25mm and rail size: 20mm The size was show on the picture,please see it whether you need before buy it.
Front ring top and both side feature picatinny for mounting laser flashlight and compact red dot and so on.
Front Lens Size: Up to 56mm - This figure describes the maximum size of the objective (front) lens.
Scope Mount with Qick Detach Locks for Picatinny Weaver Rail.