This is a 3rd slide stop screw for Yamaha cornets. It is a handmade screw machined from brass. Raw Brass specification. A simple anti-oxidation coating has been applied. The handle rod is press-fit and assembled, and no adhesive is used, so you can have it plated to your liking after you receive it. The third photo shows an example of it being attached to a YCR-3330. The instrument is not included. The screw may not fit in the original case while attached. It should be fine with slot-in cases like Protec. Thank you.