Bought out of curiosity. An excellent stable heavy tool, excellent quality, a thick tight spring - but I didn’t really understand what they could do. Cutting your nails straight or in waves, as stated on the package, will certainly not work. The haircut line is obtained only by a crescent on the contrary - the edges are long, and the middle of the nail is cut off at the root. Too bad no instructions were included. I'll look for a big dog - maybe it's for trimming claws?