This 2x barlow lens with metal body, the lens fully multi-coated provide a sharp view; it can double the power of any 1.25” telescope eyepiece, ideal for high power observation; a brass compression ring can protect your eyepiece from marring or scratching the barrel. SVBONY T adapter fits all standard 1.25" telescopes and accepts filters; thread inside tube; the T ring adapter designed compatible for Nikon DSLR SLR; note:this is not suiltable for SVBONY SV13 spotting scope.