About this item Fits 4-string or 5-string electric bass with string-through-body bridge system Total height: 13.2mm (33/64 inch), small hole diameter: 4.2mm (11/64 inch) for string through, big hole diameter: 8.2mm (21/64 inch), requires 11.2mm (13/32 inch) mounting hole. Please check our size image before you buy Made of quality steel, good durability and corrosion-resistance Used for loading the strings through body, fix them and make them vibrate more effectively, improve the resonance and increase the delay, bring more stronger tones Package includes: 5 pieces string ferrules › See more product details