Kozuka is a traditional Japanese decorative handle or fitting found on the scabbard of a sword, particularly the katana. It serves both a functional and aesthetic purpose, often made from materials like metal or wood and intricately designed with various motifs. These fittings are part of the larger category of tsuba, which are handguards on swords. Kozuka can also be used to hold small tools or items, reflecting the craftsmanship and artistry of Japanese sword-making culture. Collectors often value them for their historical significance and intricate designs.