iGotTech Heavy Duty Gym Lock: 4 Digit Combination Padlock Extra durable - high quality zinc alloy metal body that is made to last, and iron shackle for strong cut resistance. Resettable - set your own combination padlock. Very easy to use. High security - 4-dial combination for keyless convenience - increased protection from thieves compared to 3-digit locks which often can be cracked within minutes. Side window for easy combination viewing 100% SATISFACTION GUARANTEE - Aren't pleased with your combination lock for ANY reason at all? Just let us know for a FULL Refund. Your Satisfaction is Always Our #1 Priority.