This unit is primarily used to temporarily fix a floating tremolo system and stabilize tuning. It's a high-spec tremolo stopper. All parts are genuine and in perfect working order. The included thumb screw for fixing is the type without a rubber bushing. While there are some signs of use, there is no extreme wear or damage. In recent years, it has become known for being used by Guthrie Govan. It allows you to set a floating tremolo to down-only or hardtail mode, making it easy to change to Drop D tuning. It is basically a model that attaches to tremolo systems where the strings do not pass through the sustain block. It can also be attached to synchronized tremolos, but the pin-type one that is also listed is likely to be more suitable. It basically fits Floyd Rose-type tremolos, and can also be used with some big block types because the clamp can be adjusted. It's a different approach than the arming adjusters from ESP and Ibanez. We take the utmost care when listing and shipping, and handle everything after recording the condition. To prevent fraud and swapping, we generally do not accept returns or claims. Please understand. If you have any questions, please feel free to ask before purchasing.