Magnum covered lock. Shackle dimensions: 1-1/2″ L. x 13/16″ W. x 5/16″ D. Tough-Cut octagonal boron-carbide shackle is 50% harder than hardened steel. Rust-Oleum certified protection guarantees lock body will not rust. Dual-Armor construction – laminated steel core with weather resistant cover, shackle seals, and keyway cover protects against snow, rain, dirt, mud, grime and salt. Dual ball bearing locking for maximum pry resistance. 4-pin cylinder for increased pick resistance. Lifetime guarantee.