Use only the included special low-head bat pins, 1" in length, to attach the disc to the potter's wheel . Regular bat pins will stick up above the surface. If your wheel requires 1 1/2 " bat pins, e-mail or phone and I'll send those instead. There is an additional option of a 12" X 1/8" plastic bat that raises the height of our discs if you prefer to use your existing bat pins.