Features Material: The metal body ensures high strength and durability for practical use. Enhanced Stability: Designed to secure guitars strings in place, improving tuning stability and overall performance. Easy Installation: Simple to install, allowing quick adjustments without the need for special tool. Functional: Relieve the guitars strings and reduce the wear of the strings to extend the life of the strings. Package: Set of 6 blocks for replacing old or damageds Tremolo bridges insert blocks. Notice: 1.Actual color may be slightly different from the image due to different light effect 2.Please allow 1-3cm deviation due to manual measurement Size: 8.15*5*4mm Material: Metal Package List: 6pcs String Lock Insert Blocks