Question 1

How many combinations are possible? (i.e., how many stops for each wheel inside?) 10 stops/wheel would be like a 4-digit combination lock. Is that so?

Accepted Answer

Although there are infinitely many sequences you can set as the combination, the lock has only 7,500 internal positions, not counting the reset position. This means that if you set a particular sequence to open the lock, there are infinitely many other sequences that will also open the lock. For example, if you set the combination to LURL (left-up-right-left), the lock will also open with the sequence RLL.  Some people consider this a bug or defect, I think it is simply a technical aspect that is not disclosed to consumers because the mechanical explanation is too complex for the average consumer.  This technical paper by a lock collector in the Netherlands has a more detailed mathematical explanation https://toool.nl/images/e/e5/The_New_Master_Lock_Combination_Padlock_V2.0.pdf .

One of the interesting takeaways from this paper is that every sequence longer than 11 moves is equivalent to some sequence of 11 or fewer moves.  So it does not make any sense to torture yourself to remember a 12-move or 13-move sequence. For instance, UUUURRRRDDDDD is the same as LLURD.

Question 2

My granddaughter is legally blind. Do you have a blue padlock? The reason I ask is because she can't see most colors on white. Same problem with black

Accepted Answer

In my opinion, the Blue is the worst for visibility.  The stickers are dark blue with black text - almost impossible for me to read except under a bright light.  However, the great thing about these locks is that once you remember the sequence you don't have to be able to read the sticker labels.  Also you can choose a simple sequence or a more difficult one.  For my work locks I use an eight movement sequence.  For my son's lock I use a four movement sequence.  I love these locks.

Question 3

Does this only do four directions? Or can it do more? I need one that allows the combination to be five.

Accepted Answer

If I understand your question: it only allows four directions (up, down, left, right.)  But what I think you're getting at is how many steps you can add.  In that case, you can enter pretty much as many steps as your like (Gismodo used 30 steps successfully).  Personally, I've set mine for eight, giving 1:65,563 odds (and that's only if a stranger knew that I had used eight, which they wouldn't.) If you want to use five, that's fine, and will give the odds of 1:1024 (assuming it was publicly known that you only used five steps.)

Question 4

I would like a blue Speed Dial Masterlock. The description indicates that the colors are selected randomly at the time of shipment??

Accepted Answer

If you place your order before 2pm, send us an email with your order number and I'll go back to the warehouse and make sure you get the blue one.  Thanks for choosing Home Network Supply!

ASIN	B002TSN4SQ
Best Sellers Rank	203,463 in DIY & Tools ( See Top 100 in DIY & Tools ) 484 in Combination Padlocks
Brand	Master Lock
Colour	Colors May Vary
Control Method	Touch
Controller Type	Hand Control
Country of Origin	USA
Customer Reviews	4.0 4.0 out of 5 stars (7,007)
Finish	Polished
Global Trade Identification Number	00071649114694
Included Components	1
Item Dimensions	29 x 54 x 99 millimetres
Item Type Name	Set Your Own Directional Combination Padlock
Item Weight	168 g
Lock Type	Combination Lock
Manufacturer	Master Lock
Manufacturer Warranty Description	Limited lifetime warranty.
Material	Metal
Model Name	Locker Lock
Model Number	1500iD
Number of Items	1
Number of Packs	1
Number of Pieces	1
Part Number	1590ID
Recommended Uses For Product	Security
Shape	Rectangular
Special Features	Keyless, Padlock
Style	Modern
UPC	071649114694
Unit Count	1.0 count

Master Lock 1500iD Locker Lock Set Your Own Directional Combination Padlock, Colors May Vary, 1 Pack

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