Asahi Grinding Wheel Adaptor Flange? This item was purchased from a large business inventory reduction sale. I do not know the history of it. This item was among grinding wheels for an Asahi grinding machine and so I am assuming that it is an adaptor of some type. Many of the items from this purchase turned out to be new items that were kept as spares. This unit looks like it was a new spare. It does not have a part or model number on it that I can use to identify it. I have more than one of these and only one had a label on it, but the numbers don't come up in a search. The label reads, "Abwood Customer Part Number 1033040, Our part no. ABW-102537". There is a close up of the label in the last picture. They appear to be stainless steel. I put several approximate measurements in the pictures. I only have the accuracy of a tape measure. I am not able to test it. It only comes with what is shown in the pictures. I have more than one of these and so the one you receive may not exactly match the pictures, but it will be in the same condition. Only one of these had a label.