Not well engineered. [SEP] (1) The opening to insert your fingernail is too narrow for thicker nails. It opens wide enough for a child's fingernail or toenail, and for some adults, but not for me.  (2) It is difficult to to keep the magnifier in position directly over the clipping blades.  I tossed this one in our "donation"  box and decided to get a higher-quality one (I hope!) with a light in addition to the magnifying glass.