Widen Slot 1" 25.4mm&30mm Scope Ring adaptor with 20mm wseaver Light Laser PICATINNY/RAILThis item Ring Diameter is can adjust 25.4mm(1 inch) and 30mm Ring models!if you need 25.4mm ring， you only add the pad for the ring !if you need 30mm ring， you only remove the pad for the ring !