This is a wrought iron "double hook." It's a type of tool used to hang pots over an irori (sunken hearth) or fireplace. Both ends are strongly curved hook shapes, and the center is "twisted" like a rope. The whole piece is well-made, hand-forged. This is the end of a jizaigagi (adjustable hook), the part that corresponds to the tongs used for hanging pots. This fitting was attached to a bamboo support, secured with a crossbeam, and lowered into the irori for use. In the West, it's also called an "S-hook" or "double S-hook" and was used to hang pots, kettles, and Dutch ovens for fireplaces and outdoor cooking. This item was formerly owned by Masako Shirasu. Over 30 years ago, there was a shop called "Kogei" in the Seibu Department Store in Shibuya, supervised by Ms. Shirasu. When that shop closed, the items were released, and I was fortunate enough to acquire this. It's not an antique, but a household tool made by a metalworking artist recognized by Masako Shirasu (I have forgotten the artist's name). The length is 415 millimeters.