The OnGuard Mastiff 70 cm Chain Lock delivers compact, heavy-duty protection using a 645 mm (25.4 in) titanium-reinforced hardened-steel square-link chain paired with an integrated X2P Dual Lock Down head that locks both sides for superior resistance against pulling, twisting, and prying. A double rubber-coated lock body absorbs impacts and protects finishes, while the automatic keyway cover keeps dirt and moisture out for long-lasting reliability. Includes five precision laser-cut keys—one with an LED light—and is backed by OnGuard’s anti-theft protection program.