The OnGuard Mastiff 3.5&'; Chain with X4 Padlock provides dual protection with a 1040 mm (40.9 in) titanium-reinforced hardened-steel hex link chain and a short-shackle Boxer U-lock featuring the X4P Quad Lock. The lock secures the shackle on four sides to resist twisting and prying, while the 45 mm (1.8 in) chain sleeve prevents scratches. The Z-Cylinder core blocks bumping, drilling, and picking for lasting reliability. The Boxer U-lock can also be used separately as a disc lock. **Includes five laser-cut keys (one with LED).** Dual protection: Boxer U-lock with X4P Quad Lock secures the shackle on four sides, paired with a 1040 mm (40.9 in) chain for flexible, all-angle defense. Heavy-duty links: 10 mm titanium-reinforced hardened-steel hex links withstand cutting, prying, and leverage attacks for long-term performance. Versatile setup: U-lock detaches for stand-alone disc lock use-ideal for motorcycles, e-bikes, and scooters needing adaptable security. Enhanced core: Z-Cylinder resists bumping, drilling, and picking to maintain integrity against tampering and advanced theft tools. Keys and bracket included: Comes with five laser-cut keys (one with LED) and protective coatings to ensure long-lasting reliability.