25.4mm CNC Mount Rings Low Kleur:Zwart Roomy frame fits over most Kleur:Everglade Roomy frame fits over most prescription eyewearAdvanced ESS ClearZone FlowCoat lenses eliminate fog inside & prevent scratches outsideInterchangeable 2 the Minimalist Wharncliffe is the tool to get the job done when something out there needs to be cut Leapers Inc and from 1992 is supplying shooters