ITEM NAME:4PCS Durable Metal Guitar Parts Notched Radius Gauge Fretboard Measuring Tool Product Description Feature: 1. They are made of Stainless steel, features durability and corrosion resistance. 2. It is handy when you want to check a fingerboard without taking the strings off. 3. The set includes closely-spaced string notches for use near the nut, and wider spacing for use near the body. 4. The radius gauges are suitable for all popular fingerboard radii. Specification: Color: Silver Weight: about 80g Size: about 87 x 87mm/3.43 x 3.43"(L x W) Package included: 4 x Guitar Radius Gauges.4 x Guitar Radius Gauges. The set includes closely-spaced string notches for use near the nut, and wider spacing for use near the body. The radius gauges are suitable for all popular fingerboard radii.