TOOGOO(R)L-shape Square Shape Piano Tuner Spanner Guzheng Tip Tuning Hammer Wrench Tuner Spanner Tool L-shape design, easy to use it. Small and exquisite, convenient to carry it. Specially designed for tuning guzheng and most machine devices that have quadrilateral openings. The metal shaft is made of hard steel, abrasion resistance. Color: dark coffee color