SVBONY 1.25" 31.75mm Barlow Lens 3x with a Set Screw for Telescope Eyepieces This SVBONY 1.25" barlow triples;3x the power of any telescope that accepts 1.25" eyepieces The barlow provide a high power magnification allow you look more closely and more detailed at the moon's surface and other planet This barlow lens comes with a set screw to securely hold your eyepieces The 3x barlow lens includes both end caps to protect against dust and fingerprints Lifetime warranty;we confidently promise lifetime warranty for each one from us