This is a Wilkinson tremolo unit. The mounting pitch is 11.2mm, allowing for easy installation on a standard Stratocaster, while also enabling a string spacing of 10.5mm, the same as Gibson guitars. I bought this last month because I wanted to try a narrow pitch, but it didn't suit me, so I removed it. The block is also heavy and the sound was good. It's also effective in preventing strings from falling off. There were small scratches from the time of purchase, so please refrain from purchasing if you are looking for a completely pristine item. Due to size constraints, the plate and block may be disassembled for packaging. Please be aware of this. Please note that shipping will not be possible from July 25th to 29th.