The guitar measuring tool kit, made of material, is practical and durable for lasting use. Including notched radius gauges, understring radius gauges, string action ruler and feeler gauge to satisfy your need. Great for maintaining and keeping your instrument in . Could be the great guitar players and luthiers. Features - Color: Silver. - Material: Alloy. - Size: About 8.00X8.00X0.10cm/3.14X3.14X0.04inch. - Manufactured with material, they are useful and practical for long time use. - This guitar luthier tool set is great for string instrument maintaining and repairing. - This guitar luthier tool set is light weight and portable, easy to carry and storage. - Come with necessary accessories like notched radius gauges, understring radius gauges, string action ruler and feeler gauge to meet what you need. - Perfect your friends who is a guitar player, luthier, or instrument user. Package list: 4 x Notched radius gauges 9 x Understring radius gauges 1 x String action ruler 1 x Set of feeler gauge