ITEM NAME:Guzheng Tuner Tuning Wrench - Quadrilateral N1W3 Guzheng Tuner Tuning Wrench - Quadrilateral N1W3 Used for tuning of Guzheng and for most machine devices that have quadrilateral opening The shaft is made out of steel Side Length Of The Quadrilateral: Approx. 6.5mm Overall Length: Approx. 16cm / 6.3 inch Brand new high quality tuning wrench Sturdy and smooth handle Package Includes:1 x Tuning wrench Note:Light shooting and different displays may cause the color of the item in the picture a little different from the real thing. The measurement allowed error is +/- 1-3cm.