Features: The operate is simple, directly in the hand, and then to the position of the sound hole, aligns with the mouth of the steel rod, adjust the position. The end diameter is 4mm. Suitable for your folk guitar and classical guitar adjustment. Equipped with a wooden handle for better operate when making adjustments. Compact and light weight, easy to carry, and capable of easily tuning instruments at anytimes. Suitable for beginners and professional performers, quickly achieve precise pitches adjustment. Specifications: Component: Steel and wooden handle Length: about 12cm/4.72inch Package Includes: 1pc Guitar Wrench note: Please allow 1-2cm errors due to manual measurement, make surely that you not mind before order. Due to difference between different monitors, the picture may not reflect the actual color.