Master Lock 1178DAU ProSeries® Resettable Combination Padlock is designed for commercial/industrial applications and features a 57mm wide die cast body for strength & durability and a 28mm tall, 10mm octagonal boron-carbide shackle for ultimate cut resistance. A set-your-own combination feature offers convenience and security with 10,000 possible combinations – no reset tool required – and a deadlocking mechanism protects against prying, shimming and rap attacks.