Product Name:1in / 30mm Tube Precision Shooting Hunting Scope Sight Bubble Level Item No.:2020427 Material:High Quality Aluminum Alloy Dimensions / Size:30 mm Weight:30 g Unit Packaging:Box ● Compatible with: 1-inch and 30mm Riflescope Tube ● CNC machined using high quality aluminum alloy to achieve highest level of precision ● Mounts quickly and easily to the Riflescope tube ● Use the bubble level to ensure that the rifle is perfectly vertical