Note: With proper use, the MusicNomad nut file with diamond coating will last a very long time. Originally known from industrial applications, diamond is considered one of the most durable abrasives available. Only use these files for nuts made of bone, graphite, plastic or TUSQ materials, or for brass or zinc saddles. The files are not suitable for steel. Clean the files regularly with a brush to remove filing residues from the gaps in the diamond coating. If the grinding effect on the front part of the file wears off, the file can be rotated at the handle to position the less-used rear part towards the front.