Diamond File Set 6 Pcs Heavy Duty Diamond Coated File Set Mix Grit 40, 80, 150, 240, 400, 600 for Sharpening Tools, Metal, Glass, Stone, Tile - 7 inch Long - 3 inch Coated Surface Diamond Grit File

Worked well for my specific use, for fine delicate work.. It would have been appreciated to have the grit sizes on the packaging.

Great set of files for hobbyists of all types. Being diamond coated and a very high grit, I wouldn't recommend them for use with metal or wood ininitially.I used them for plastics, and used another high grit file, and used these to finish it off stepping into a higher grit.The file grooves do fill up pretty quickly working with plastics, but cleaning is easy. I use an ultrasonic cleaner which removes all debris while keeping edges sharp. Warm water and a stiff nylon/tooth brush will do fine, brake cleaner for slight rust or for stubborn cleaning. Always rinse and use the highest content isopropyl alcohol you can find to pour over it to dry and remove any water to avoid rust.

The files are too flexible and the abrasive doesn't seem to cut very much.

Seems to be working fine for sharpening hand tools and pruners.

Very useful for hand finishing 3D printed plastic parts. Used the files with PLA which tends to be brittle.