𝙏𝙬𝙤-𝘾𝙪𝙩𝙩𝙞𝙣𝙜-𝙂𝙧𝙞𝙩𝙨-𝙞𝙣-𝙊𝙣𝙚 𝙁𝙞𝙡𝙚 - you can use the coarse teeth side to deepen the nut seating slot of your classic and Dobro guitars, while use the fine teeth edge to smooth the surface, a few strokes can achieve excellent result 𝙋𝙧𝙤𝙩𝙚𝙘𝙩 𝙉𝙪𝙩𝙨 𝙎𝙞𝙙𝙚-𝙬𝙖𝙡𝙡 - the two smooth sides designed to leave the nut seating walls unscarred; also the file is little narrower than nuts size specified to keep the file from binding in the nuts slot 𝙑𝙚𝙧𝙨𝙖𝙩𝙞𝙡𝙚 𝘼𝙥𝙥𝙡𝙞𝙘𝙖𝙩𝙞𝙤𝙣 - it's a necessory home repair tool for you to maintain nuts seating surfaces of your guitars, basses, banjos, mandolins, also great for luthier and DIYers to remove nuts-glues or debrics 𝙎𝙖𝙫𝙚 𝙔𝙤𝙪 𝙏𝙧𝙚𝙢𝙚𝙣𝙙𝙤𝙪𝙨 𝙏𝙞𝙢𝙚 - use T12 carbon tool steel, long-lasting sharp teeth, 3/16" width plus 4" cutting length, just a few strokes help you do your own guitar nut replacement work 𝙂𝙤𝙤𝙙 𝘾𝙤𝙣𝙩𝙧𝙤𝙡 𝙏𝙤𝙤𝙡 - heavy and well balanced, rubber-coated handle for good grip, very nice to level a fretboard nut seating grooves square 𝙋𝙖𝙘𝙠𝙖𝙜𝙚 𝙄𝙣𝙘𝙡𝙪𝙙𝙚𝙙 - 1 x luthier nut maintainenance file, 1 x small brass wire brush to remove rust and filings