Leupold Alumina Flip-Up Long Gun Optic Cover 52mm VX-6 Models, Objective, Matte Black

I waited a year to purchase these. Although they are a little pricey, you get what you pay for. These are by far the best covers I've ever owned. They are quick, quiet and keep my lens clean. Leopold has matched great covers with great glass. I'll be buying a set for my other Leopold scope

To have the cover thread into the scope makes this a game changer. Flush and tight, these will not move or potentially disengage from your scope like other brands. The magnetic lid closure is an awesome feature. Although on the expensive end compared to others, these should be well worth it in the end.