Ideal for high crime areas, campuses, suburban and recreational areas, the 8005 Pitbull DT U-lock offers a very high level of theft resistance. X4P Quattro Bolt Locking Mechanism secures all four sides of the hardened steel shackle and resists attack from prying, jacking, pulling or cutting. Z-Key Cylinder with BumpBlok protects against misuse and renders bump keys useless. Heavy-duty cable easily threads its way through the bike frame and wheels.