This is a replacement neck plate with a 4-bolt design for securely fastening the neck joint of guitars and basses. It enhances the stability between the neck and body, which can positively impact playability and sound. In addition to its practicality, it's also a recommended part for customizing and dressing up the appearance. The thickness is approximately 2.0mm. The items shown in the photos are all that are included, so please check the condition in the images.