Leapers 30mm Rings, Medium, 3/8" Dovetail 30mm tube diameter Medium profile Fits 3/8" dovetail with vertical stop pin Four hex screws per ring to secure the scope Reversible locking plates for varied dovetail rail sizes Aircraft-grade aluminum Anodized black matte finish Includes one each of 2.5mm, 3mm, and 4mm Allen wrenches Comes with two hex screws and a spare set screw/pin Special tape inside the rings keeps your scope tight without excessive clamp pressure.