High Quality MaterialThis Radius Gauge Guitar is made of high quality stainless steel, rust and corrosion resistant, with good hardness, delicate workmanship, smooth and rounded edges, sturdy and durable. long life. Dimensions This Understring Radius Gauge Kit includes nine radius sizes of 7.25, 9.5, 10, 12, 14, 15, 16, 17, 20. It can accurately measure the neck radius of the instrument and meet your different use needs, which is convenient and practical. Simple and AccurateThis Under Radius Settlement Gauge -String helps you fine-tune your instrument and keep your stringed instrument in near-perfect playing condition to ensure you play the right chords without getting tired. Guitar ToolThis tuning tool Guitar gauge can be used to change strings, make necessary measurements and adjustments on the stringed instrument, adjust the pitch, adjust the movement or check the pitch of the strings. Widely Used This Luthier Tools Gauge is suitable for electric guitars, electric basses, acoustic guitars, folk guitars, electric guitars, tactile arc measurements, string codes, piano radian adjustment, etc.