1TOUGH MATERIAL: The guitar string action gauge ruler tool is made of high hardness stainless steel and can handle any strenuous movement and drops 2SMOOTH EDGES: Guitar string action gauge reject any jagged edges, and you'll get a very flat and smooth smoothed edge, you can use with confidence 3STABLE AND RELIABLE: Each contact edge is very straight and smooth, and if you feel an abnormal wobble, that is where the buzz is, not the uncertainty that the jagged edge of the product gives you 4CLEAR SCALE: Guitar string action gauge ruler beautiful black plating avoid specular reflections you don't want to encounter. The white scale make reading clear and easy to understand 5ENOUGH THICKNESS: The electric guitar string action gauge is 1mm thick, and you don't need an easy to bend, paper thin wire stick 1 x Guitar String Action Gauge 1 x Corner Guard