Standard size: The wrench head is designed as 5 / 16 7mm hexagonal socket, suitable for most common guitar screw specifications Good materials: Metal materials, this product is sturdy and, and can be used for a long time without being easily damaged Fine processing: The product has undergone fine processing, with smooth surfaces and smooth, avoiding scratches or other damage to the guitar Multi functional use: The guitar metal wrench 5 / 16 7mm hexagonal socket guitar wrench is a multifunctional tool suitable for adjusting guitars of various types and brands Accurate tuning: This wrench has the appropriate size to accurately adjust the height of guitar strings and other important component, helping guitarists achieve the desired sound, Manufacturer: ZBIianxer