Features: 【】This guitar string winder head tool is new and high-quality. 【For Electric Acoustic Guitar and Bass】Designed for both acoustic guitars and electric guitars, as well as bass guitars and electric bass guitars. 【Assemble with Electric Tools】This string winder head tool is designed to be assembled with electric tools, making the string changing process faster and easier. 【Hexagonal Diameter 6mm】The hexagonal diameter of this tool is 6mm, a secure fit and easy handling. 【Compact Size】With a total size of 8 x 4cm(L x H), this string winder head tool is compact and convenient for storage and transportation. Specifications: Part Name: Guitar String Winder Head Tool Material:ABS, Metal Size:8cm x 4cm x 4cm(L x H) Color:Black Package Content: 1x String Winder Head Tool Note: 1. The real color of the item may be slightly different from the pictures shown on website caused by many factors such as brightness of your monitor and light brightness. 2. Please allow slight manual measurement deviation for the data.