When it comes to long-range shooting every little detail counts. Having a quality level indicator is crucial to your accuracy. This slim, low-profile design allows the Bubble level to be mounted on most scopes without removing the scope from the rifle. It is easily visible without losing the sight picture. Mounts quickly and easily to the riflescope tube. Made of aluminum that is flexible enough to be spread apart and slipped over the scope without breaking. Weighs .4 Oz.