[Robust and stable]Magnifying glasses are comfortable on the nose. The noseband and forehead are well padded. This helmet magnifier can be used with any pair of goggles. [Great]When precision is a must, these clip-on magnifiers easily clip onto any regular pair of goggles for provide variable magnifications for hobbies, crafts, and detail work on a variety of projects. [Comfortable to Wear]Comfortable glasses frame fits snugly and comfortable headband reduces pressure on the nose, can be used for a long time and relieve fatigue. It can also be used with any pair of glasses. [Easy to use] The frame design is easy to open or close, as convenient as normal glasses, but more useful for checking jewelry, watches and other luxury items more clearly and faster. Note: The data is all manual measurement, please allow 1 - 3cm error, due to the difference of light and display, there will be a certain color difference, depending on the physical object received.