Pro Series-Die-Cast-Zinc-Body-4-Digit-57mm-Padlock-Master-Lock-1178D-p-The-Master-Lock-1178D-Pro Series-reg-4-Digit-Padlock-has-a-strong-&-durable-die-cast-zinc-body-with-octagonal-boron-carbide-alloy-shackle-which-gives-the-lock-superior-protection-against-forced-removal-by-cutting-The-resettable-4-digit-lock-has-the-possibility-of-over-10-000-combinations-&-the-Deadlocking-Mechanism-protects-against-prying-shimming-&-rap-attacks-p-p-The-combination-dials-are-extremely-easy-to