An odachi is a type of Japanese great sword defined primarily by its exceptional length. Where a standard katana measures roughly 38 to 42 inches overall with a blade of 27 to 30 inches, an odachi is considerably larger - blade lengths of 35 inches or more are typical, with overall lengths that can range from around 55 inches to more than 60 inches depending on the specific configuration of blade, tsuka handle, and fitting proportions. This scale difference is the most immediately striking characteristic of the odachi category and the primary source of its appeal as a display collectible. The longer blade means more surface area for appreciating the steel's character, more visual presence in a room, and a stronger impression on anyone encountering the piece for the first time. Construction-wise, an odachi shares the same fundamental features as a katana - a curved single-edged blade, full-tang construction, tsuba guard, wrapped handle, and matching scabbard - but scaled up to the dimensions that define the great-sword tradition.