First you’ll narrow the possible combinations from 64,000 down to 100. But you don’t have to try each of those 100 combos. There’s a simple task you go through to figure out the actual combination in a matter of minutes. Or just make a shim out of a coke can and pick it in 2 seconds. Now that you know a simple combo padlock is basically just a deterrent, you shouldn’t ever use one to lock up anything of real value.