This product is only for making prepared hole. There are no shaft holes, so you can make any size holes up to the largest size possible and use it. Please be aware that no supports for drilling and key-way milling, etc.
It is a reliable manufacturer and I have been using parts here for a long time. I am satisfied with this product satisfactorily. Since the shank part is a highly versatile shape, I am happy that it can be processed and used in my favorite form. However, how to hold the core on the lathe while cutting the core during shank processing is a problem.