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

as a ‘flower frog.’ This tool is essential in the traditional Japanese art of flower arranging, known as Ikebana. The kenzan is designed to hold floral stems in place, allowing the arranger to create delicate and balanced compositions.

Often made from brass or lead, a kenzan provides a stable base for floral arrangements, ensuring that each stem remains exactly where it is placed. The spikes are carefully positioned to grip the stems without causing damage, allowing for both aesthetic precision and practical stability in floral displays.