Easy to use and compact size for storage and transport. Accuracy: With bubble to crosshairs are aligned for in line placement and doping adjustments. With strong magnet in the bottom for easy hands-free use. The bubble for shell is acrylic, designed for scoperifle levelingCompact: The for shell is acrylic and easy to use and compact size for storage. Use: Place the Scope Turret on the top scope and the Action the once the levels show a scope, and then simply tighten down., Manufacturer: SLXLYH