Features:

Made of stainless steel, it has anti-rust and anti-corrosion properties. It is durable, it will not rust in dry environment, and it is easy to store. You can use it for a long time without changing it frequently,compact and light in weight, easy to carry.
Use these gauges to determine the thickness of the material before working to save time and material, they can help you quickly and accurately correct and resolve any wrong thickness, simply like to use this tool, the quality is great, and the numbers are very easy to read, even if the tool is dirty, you can still read without problems, it's a profesional tool, heavy and feels great on the hand.
Lightweight and small size, easy to use and carry.
Designed for gaging steel music wire, has a range from wire gauge numbers 13 to 24.
Suitable for piano tuning tool, measurer for piano music wire and chord.

Specifications:

Color: Silver
Material: Steel 
Pattern: Round
Diameter: As the picture shows
Weight: Approx. 25g
Application: Piano tuning tool, measurer for piano chord and music wire
SKU:PT0908-078

Package List:
1*Piano String Ruler