coarse file

Pieces are carved into shape using a rasp or coarse file.

Wear cannot therefore be simulated by just sand-blasting the whole object, nor even by concentrating on the vulnerable parts with a coarse file.

His grandfather had explained that the only true way to bake bread was to burn it black and then rasp off the burnt extremities with a coarse file.

Well, I thought, you must use a coarser file; so one afternoon I said to the head sister, an elderly and very shriveled virgin of fifty or so, 'Off with your knickers, Cleopatra; I want a word with you!'

Brighto says, The original musical instruments are the drum, the rattle, and the wooden or bamboo coarse file with rows of sharp points on its surface made of notched sticks which are rubbed with another piece of wood or even with a shoulder blade.