This is a mounting component for cowbells, wood blocks, etc., to attach them to stands. I probably bought it about 30 years ago and used it back then, but it has been stored in a closet for a long time. The screws can be attached and detached normally, and there are no problems with use, but there is dirt, scratches, and peeling of the plating. Please make your judgment based on the photos. In particular, the plating on one of the wing nuts is severely cracked. *To attach an instrument to this product, you will need the wing nuts that came with the instrument when you purchased it. Based on the numbers written on the box, I think I bought it for either 9,500 yen or 8,306 yen. I think it is a rare item that is now discontinued.