Includes: Modular Scope Rings, Level Bubble, 45 Degree Picatinny, Hardware Materials: 6061 Aircraft Grade Aluminum Compatibility: Rifles with Picatinny rails Weight: 5.00 oz Diameter: 30mm with 1 inch insert Color: Black Warranty:Lifetime The Monstrum Modular Scope Rings offer maximum flexibility for your preferred rifle scope setup. They can be used as stand alone scope rings or with the included accessory attachments - a modular fold-out level bubble and a modular canted picatinny red dot base.