Materials: 6061 Aircraft Grade Aluminum Compatibility: AR-15, Rifles with Picatinny rails Weight: 4.3 ounces Diameter: 1.00 in Length: 5.75 in Base Length: 3.00 in Color: Black Warranty: Lifetime When you've got your guns and gear strapped to your back, every last once matters. That's why we've taken our best-selling line of lightweight scope mounts and made them even lighter! With a newly designed hollowed out 6061 grade aluminum frame, the Monstrum H-Series scope mounts shave precious ounces off your pack without sacrificing durability or performance. Weighing in at 4.3 ounces, the MH250 Hollow Frame Scope Mount is comparable in weight to a pair of scope rings while maintaining the added rigidity and convenience of a one piece mount. Available for both standard 1 inch and 30 mm tube diameter rifle scopes, it mounts securely to standard Picatinny rail platforms. The scope mount uses hardened steel Torx mounting hardware to prevent stripping of the bolts.