Features_x005F_x000D_Material: The metal body ensures high strength and durability for practical use._x005F_x000D_Enhanced Stability: Designed to secure guitars strings in place, improving tuning stability and overall performance._x005F_x000D_Easy Installation: Simple to install, allowing quick adjustments without the need for special tool._x005F_x000D_Functional: Relieve the guitars strings and reduce the wear of the strings to extend the life of the strings._x005F_x000D_Package: Set of 6 blocks for replacing old or damageds Tremolo bridges insert blocks._x005F_x000D_Notice:_x005F_x000D_1.Actual color may be slightly different from the image due to different light effect_x005F_x000D_2.Please allow 1-3cm deviation due to manual measurementSize: 8.15*5*4mm_x005F_x000D_Material: Metal Package List:_x005F_x000D_6pcs String Lock Insert Blocks