Pair of rings for Picatinny in reinforced steel, ø 34 mm H 12 mm – Supplied content: – 2 blue steel rings – 1 wrench. Note: – These rings only fit Picatinny rail, not weaver. These Blued Steel Picatinny rings are precision made by Contessa Alessandro & C. snc These parts are precision made to fit onto picatinny rail systems with the wrench supplied. Each ring is tightened with 4 screws, offering a very firm and reliable accessory. The ring is attached to the picatinny rail with a hex nut.