A Tokujo-grade saya from Sakai Takayuki sized for a 600mm tuna knife (maguro-kiri) — the protective sheath that keeps the long blade's edge safe in storage and transport, and keeps hands safe around it. Sakai Takayuki has forged knives in Sakai (Osaka) for over 600 years.

• Type: Saya (protective blade sheath)
• Fits: Tuna knife, 600mm blade
• Series: Tokujo
• Maker: Sakai Takayuki, Sakai (Osaka), Japan