This listing is for a neck receiver for a Yamaha YTS-23 tenor saxophone. This is a genuine Yamaha spare part that is still in factory sealed packaging. These are generally not available to the general public, but rather must be obtained through a Yamaha dealer. This one came from the closeout of a sax repair business. This is the tenon receiver only (no screw). Please note that installing this is a job for someone experienced in soldering techniques as they pertain to musical instrument repair. In other words, it's not a DIY job unless you really already know what you're doing!