In a naginata, full tang means the steel of the blade extends as one continuous piece down through the entire length of the handle shaft, rather than stopping at the collar or fitting only partway into the handle. This construction method creates a structurally unified piece where blade and handle share a single steel core. For display and collection purposes, full tang construction ensures the piece maintains its assembled integrity over time — there's no separate blade section that can loosen from the shaft with age or humidity changes. It's also the construction standard that most closely reflects how high-quality historical naginata were built, which matters to collectors focused on authenticity of form.