Specifications 6061 Aircraft Grade Aluminum CNC Machined Mounts To Any Picatinny 1913 Or Weaver Rail Type II Class 3 Hard Black Anodized O-Ring Sealed Waterproof compartment Non-Slip Mil-Spec Retention O-Rings All Weather - No Heat Transfer Self Locking Wing Nut Systems Ultra Light Weight Only 5.8oz Overal Length: Standard 4.5" - Shorty: 3.5" Lifetime Warranty 100% USA Made