Piano Tuning Wrench L-Shape Piano Tuner Spanner Repair Tool Professional Wrench Piano Tuning HammerP202112241019 Adjusting the wrong sound needs a professional tuning tool.abrasion resistance.Weight: 78g or 2.74ozSturdy and handle.L-shape , easy to use it.Small and exquisite, convenient to carry.Specially designed for tuning of Guzheng and for most machine devices that have quadrilateral opening.In order to maintain the accuracy of piano sounds, regular inspection by a professional is necessary.colour:brownMaterial:Metal and plasticsize:15.5x3.8x2cmInner bore size: . 0.65cm or 0.26inHandle Length: . 10.5cm or 4.13inPackage Contents:1xTuning WrenchNote: measure the tip size of your device purchasing, make the size of your devices match with the wrench quadrilateralOnly the above package content, other products are not included.Note: Light and different displays may cause the color of the item in the a little different from the real thing. The measurement allowed error is 1-3cm.