Features: Made of Stainless steel and plastic, it has durability and corrosion resistance. The design of the T-shaped guitar ruler makes it easier to use and control. Guitar String Action Ruler has the function of measuring the distance between the guitar string and the neck, which allows the string distance to be accurately measured. There are common guitar size scales on the guitar ruler, making it easy to measure the length and spacing of various parts. Suitable for instrument maintenance and adjustment, ensuring the perfect condition of the guitar. Specifications: Materials: Stainless steel and plastic Guitar Radius Gauge Size: about 70x65mm/2.76x2.56inch Guitar String Action Ruler Size: about 51x89mm/2.01x3.5inch Package Includes: 9Pcs Guitar Radius Gauge 1Pc Guitar String Action Ruler note: Please allow 1-2cm errors due to manual measurement, make sure that you not mind before you order. Due to difference between different monitors, the picture may not reflect the actual color of the item.