Features: Carefully manufactured, with compact structure, durable and anti-corrosive. Can helps to lock the strings and is suitable for stringed instruments such as guitars. Selected materials, black plated brass lock nut + camel bone nut. Small size, easy to carry and store, easy to use and good practicality. Strict quality control and quality assurance, high safety factor, can be used with peace of mind. Specifications: Material: Brass and Camel Bone Size: 4.34x1.4x0.75cm, 5.06x1.4x0.75cm, 5.77x1.45x0.75cm Type: 6-String / 7-String / 8-String Note: 1.Please allow 1-2cm errors due to manual measurement, make sure that you do not mind before you order. 2.Due to difference between different monitors, the picture may not reflect the actual color of the item. Package includes: 1 Set Guitar Locking Nuts