Vortex Bubble Level 30mm
Vortex Bubble Level 30mm, For the most precise long-range , use the bubble level to ensure that everything is perfectly vertical. This will eliminate potential error caused by holding canted.Mounts quickly and easily to the scope tube.Outside Diameter (inches) 2.2 - 2.4 inchesOutside Diameter (mm) 55 - 61 mmWeight 6.7 oz