This is the last flip cap you will ever need! Virtually indestructible, this cap will fit snugly on nearly all Vortex Optics® and features a snap flat spring that will keep your line of sight unobstructed.
Outside Diameter (inches) 1.5 - 1.6 inches
Outside Diameter (mm) 38-41 mm
I have had a set of these Defender caps for my objective and eyepiece of my scope for about 3 years now and I will have to say they are the longest lasting caps I have ever had and are made extremely durable. Will be buying another set when I have the need.