Unbranded Barska Optics AI11490 30mm Low with 1 in. Insert Tactical Rings with build-in Picatiny Rail See-through Picatiny Base

30mm Low with 1-" Insert, Tactical Rings with built-in Picatinny Rail, Includes 1 detachable rail top (rail length measures 1.75-"), 1 standard top and 1-" inserts. Height:.94-". Diameter: 30mm. Overall: 1.73-". Material: Aluminum. Finish: Black Matte. Rings/Pkg: 2. Set Screws: 1. Lock Nuts: 6.