Higoo 1.18 Inch(30MM) High Profile Scope Ring Mount, 30MM Riflescope Opitcs Ring, Fix Picatinny Waver Rail 2PCs In One Package Precision Machined from Aircraft-grade Aluminum Alloy with Anodized Black Matte Finish. 30MM Ring fit Picatinny Waver Rails Friendly Hex Screws, Wrench, Easily install and remove