With strong magnet in the bottom for easy hands-free use.Easy to use and compact size for convenient storage and transport.The bubble shell is made of acrylic, designed for scoperifle levelingCompact: The shell is made of acrylic and plastic, easy to use and compact size for convenient storage.Accuracy: With level bubble to ensure crosshairs are aligned for in line placement and reliable doping adjustments.How to Use: Place the Scope Turret Level on the top scope cap and the Action Level above the bolt; once the levels show a level scope, and then simply tighten the rings down.Material: ABSColor: As the Picture ShowsPackage Dimension: approx. 6x4x1.7cm/2.36x1.57x0.67inchesNet Weight: 20g/0.04lbsPlease allow 1-2cm errors due to manual measurement. Due to the difference between different monitors, the picture may not reflect the actual color of the item.2pcs/set Magnetic Gunsmith Level