Small review but I’ve run two sets of vortex defender lens caps on two scopes a Strike Eagle and a DiamondBack I found them to be easy to install , easy to take off and I love that they lay flat on the scope .seem in my humble and limited opinion they are better made and more durable than butler creek and light years beyond any bikini type rubber job. Also like that you can paste your dope /drops into the rear cap lid and have it right in front of your ocular input device’s.