Description:Material: This bass string lock nut uses zinc alloy as the material, which is wear-resistant, examines, and can be used for a long time. Spare Part: This electric bass guitar fixed tool can be used as a spare part to replace your old or damaged bass accessory. Easy to Install: This bass string spare part comes with a wrench and screws, which can be easily installed on your instruments. Compatibility: The professional bass spare part is suitable for 3, 4, 5, 6, 7 and 8 strings of electric stringed musical instruments. Gifts: Repair accessories with wrench screw can be used as a special gift for your musician, player, friends or beginner instruments. Specification: Material: Zinc alloy. Suitable for: 3, 4, 5, 6, 7, 8 string electric bass guitar. Color: Black. Size: Approx. 6.2x6.8x1 5mm/0.24x0.26x0.59inch. Note:There may be several color distortions due to different computer resolutions. There may be a slight error due to different manual measurements. Package Included: 6pcs string locking nuts (1pcs wrench, 6pcs screws).