Found this heavy, spiked metal disc in the back of a junk drawer. Sharp as needles. No idea what it’s used for?

Disc Is Used in Japanese Ikebana
In Ikebana, the kenzan plays a crucial role by anchoring plant materials in a vase or shallow dish. The arranger can place stems at various angles, creating dynamic and asymmetrically balanced designs that are characteristic of this art form. The kenzan’s weight keeps it stable, preventing top-heavy arrangements from tipping over.
By securing the base of each stem, the kenzan allows for greater creative freedom, enabling the arranger to manipulate the shape and flow of the composition. This flexibility is essential in Ikebana, where