Shop name:Chong Qing Shuo Yue Ke Ji You Xian Gong Si The revolutionary new tool fretbar understring leveler lets you level your frets under full tension without removing the strings. You can level your frets with the strings ON. Material: Aluminum - machined. High glossiness, durable and long-lasting , not easy to deform. Cuboid shape. Dimensions:Convenient luthier sanding leveler file. Applicable for fret, saddle, and fingerboard sanding, great accessory for players and luthiers. Suitable for the fret leveling of electric guitar, acoustic guitar, electric , banjo, mandolin, etc. Colour:Black Material:Aluminum alloy Size:Length: about 23cm Package Contents: 1* Fretbar Understring Leveler Only the above package content, other products are not included. Note: Light and different displays may the color of the item in the a little different from the real thing. The measurement allowed error is +/- 1-3cm.