These tuning pins can tightly fix the strings, allowing the guitar to maintain the pitch to enhance the playing pleasure.Universal size guitar string tuning nail head tuner, suitable for almost all acoustic guitars and electric guitars.Model Number: Guitar Tuning PegsType: Tuning PegFeature 1: Guitar Tuning PegsFeature 2: Electric Bass Tuner PegFeaturesMaterial: Metal/zinc alloyColors: BlackSize: Approx. 8.5 x 4 x 4cm/ 3.35 x 1.57 x 1.57 inch (L x W x H).Package Contents:4 x Guitar String Tuning and Mounting Accessories2 x Bass String Retainer2 x Mounting screws