# Master Lock 1500EDBX DialSpeed

Made up with letters and numbers, this lock makes room for more than 22 million combinations.

Security 7 of 9
Master Lock 1500EDBX DialSpeed Courtesy Master Lock

Ordinary locks have only 64,000 possible combinations, making them relatively easy to crack. The Master Lock DialSpeed, which includes the alphabet in addition to numbers, has more than 22 million. Users come up with a 4- to 12-digit alphanumeric code, which is more secure than the standard three-number code and easier to remember than a randomly assigned series of numbers or clicks. The lock can store one master code and up to three “guest” codes. \$25

I think this is an awesome product and I especially like the option for guest codes.

However, I have to point out that it is impossible to have a "10-digit alphanumeric code" under any circumstances. Largely because when you say your code is "10-digits" your code is, by definition, confined to only containing numbers. :) For this to be accurate, you have to say you have a "10-character alphanumeric code".

I'm slightly embarrassed to say that it pretty much filled me with glee to find an error in this magazine that I was actually capable of correcting! Sheer glee, I say!

I'll see myself out, thanks...

Sorry, you're 22,000,000 possible combinations number is wrong.

There are only really 4 positions on the wheel: Up, Down, Left, & Right. ABC123DEF are all considered Up.

So, with 12 possible "digits", the possible number if 4^12, or 16,777,216 combinations you can dial.

However, on the inside, there are 4 wheels with 12 different positions each, so despite what it shows on the outside, internally, there's only 12^4 possible combinations, or 20,736.

This means that for every correct combination you can dial, there are on average about 808 other combinations you can dial that will also work.

Also, just for the record, a regular Master Padlock really only has 4,000 possible combinations inside.

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