Item Type: Guitar Tone Volume Knobs Material: Iron 1WITH SCREWDRIVER: Holed guitar, bass volume control knob, equipped with a screwdriver for you to install and use, very convenient 2GOOD REPLACEMENT: Used for replacing dirty, damaged and old knobs, great for electric guitars and basses 3WEAR RESISTANT IRON: Made of iron material, with high mechanical strength, wear resistance, corrosion resistance 4GREAT PERFORMANCE: Made with fine workmanship, possess compact appearance and stable performance, can make sure durability and stability 5GIFT FOR MUSIC LOVERS: This is an important music instrument accessories, can be used as a great gift for your friends or music lovers 4 x Guitar Tone Volume Knobs 1 x Screwdriver