About this item Including everything for string changes and set-ups, perfect for maintaining and keeping your instrument in perfect playing condition. Change strings, set intonation, adjust action, check string height and more. Suitable for: electric guitar, bass, mandolin, banjo, ukule, acoustic guitar and so on. Guitar files are in various shape, equaling flat, round, half round. String Action Ruler Gauge Tool could be uesd on both side. It's easy to read, so checking and adjusting string action will definitely be a breeze. Screwdriver: you can adjust screwdriver's length and exchange its head by pressing the Round Iron Piece in the middle of the screwdriver. String Organizer makes changing strings quick and easy. Guitar fingerboard guards for protecting your guitar or bass fretboard from scratching or damaging while filing and polishing. Guitar wire plier is suitable for cutting soft alloy/copper/iron wires, guitar strings, cable ties, pins of electronic component. Muti Spanner Wrench will tighten or loosen most nuts or thumb wheels found on guitars, like output jack, control pot, pickup switch, tuning machine and bridge thumbwheels.