This saw is used for pruning citrus trees. After 4 years of minimal use, it started to stick a little during cutting because it lost some of its sharpness. When I tried to sharpen it with a file, I made it worse. I also sharpened the teeth, which are double [without it being necessary]. After this sharpening, I completely ruined a brand new NIKOLSON file. The blade is made of very hard steel. I bought the same saw again and the old one was reassigned for dry wood.