Hardness tool steel , impact resistance, strong torsion, high hardness, not easy to rust, easy to carry, easy to adjust the key cover, after long-term use or replacement of the key cover rubber pad, the position of the saxophone does not with the sound-changing hole, resulting in sound loss, etc. , Use the saxophone wrench to adjust the position of the key cover to with the seal of change hole. of application: saxophone/flute, clarinet trimming tools Colour:silver :steel Size:13 x 1.1cm Package Contents: 1 x Sax Key Cover Adjustment Wrench Only the above package content, other products are not included. Note: Light reflection 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.