The Master Lock No. 1178 ProSeries® Resettable Combination Padlock is designed for commercial/industrial applications and features a 2-1/4in (57mm) wide die cast body for strength & durability and a 1-1/16in (28mm) tall, 3/8in (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.