Original DISKUS design: 360° protection, Stainless Steel case: Solidly reinforced for extra strength. Hardened steel alloy shackle: Resists hacksaw attacks. Diskus "Deep Welding Technology": Maximum strength. Anti-cut plate: Protects the gap in the shackle. Precision, mushroom pins & paracentric keyway: Comprehensive anti-pick protection. Key retaining. Made in Germany