ITEM NAME:Stainless Steel Piano Tuner Wire Guage Ruler Keyboard Ruler Numbers 12-24 Description: It is made of stainless steel which is better than the plastic one Piano tuning tool, measurer for piano and music wire This tool helps to stretch the string so the settling period for the string isn't so long. It also aids in seating the wire on the bridge The gauge is designed for gaging steel music wire and has a range from 12 to 24 Material: Stainless Steel Size Chart: L x W x T: Approx. 143x24x1.5mm/5.63X0.94X0.06 inch Package Includes: 1 Piece Piano Measurer Note: Due to the difference between different monitors, the picture may not reflect the actual color of the item Due to manual measurement, there may be 1-2mm error in size SKU: DMO0015811261001809.It also aids in seating the wire on the bridge. It is made of stainless steel which is better than the plastic one. The gauge is designed for gaging steel music wire and has a range from 12 to 24. Material: Stainless Steel.