The Master Lock U-Lock features an 11cm wide hardened steel body for maximum strength and reliability. The 13mm diameter double locking shackle is 21cm long and made of hardened steel, offering extra resistance to prying, cutting and sawing. The disc key cylinder prevents picking.Master Lock U-Lock FeaturesHardened steel body resists cutting, sawing and pryingDouble locking shackle withstands 2 tons of pull forceProtective vinyl coating helps prevent scratchingIntegrated disc keyed locking mechanism for maximum pick resistanceSliding dust cover protects keyway from dirt and moistureSoft grip for comfortable use, weather and scratch resistanceCarrier bracket included for easy transportationCertified : Sold Secure Gold, VDS, SBSC, Secured by design More info