Description:9pcs understring radius gauge: including 7.25", 9.5", 10", 12", 14", 15", 16", 17" and 20" radius, can be used to accurately measure the radius of the fret board, the radius of the saddle nut radius from the top or bottom surface of the radius, necessary for the maintenance and adjustment of the bass guitar.32 Sheets Feeler Gauge: 32 hardened, hardened steel sheets, measurement from 0.0015 inch (0.038mm) to 0.035 inch (0.889mm). Feeler gauge is a guitar common chord spacing distance measuring tool, main shaft for easy to clean and professional look. It can be used to measure all kinds of electric guitar, electric bass guitar, acoustic guitar, acoustic guitar, electric box guitar neck measured in radian, radians to adjust the piano string code. The two measuring tools for guitar are small in size, pull-up radius: 7 x 7 cm/ 2.76 x 2.76 inches, feeler indicator: 9.5 x 1.5 x 1.5 cm/ 3.74 x 0.59 x 0.59 inches, easy to store, do not take up too much space. Specification: Material: Stainless Steel. Color: silver. Size:Understring Radius Gauge: Approx. 7x7cm/ 2.76x2.76 inch. Feeler indicator: approx. 9.5 x 1.5 x 1.5 cm / 3.74 x 0.59 x 0.59 inch. Note:There may be a bit of color distortion due to the different resolutions of your computer. There may be slight errors due to other manual measurement. Package Included:1 x Pull-up Radius Indicator.1 x Feeler Indicator.1 x Keychain.