CCOP Rifle Scope Picatinny Weaver Steel Ring, 30 mm Low Profile30 mm diameter Picatinny/Weaver Steel Ring constructed from solid and durable heat-treated 12L14 steel. This ring is easy to install and comes included with torx screws and driver. Material: Steel Ring Diameter: 30mmProfile: Low Width: 15.88mmSaddle Height: 4.30 mm Screws per Ring: 2See-Through: No Weaver Rail: Yes.22 Dovetail: No.