For extra security, it is best to create a longer combination using several of the up, down, left and right positions. The Master Lock Speed Dial Padlock With A Digital UI Is Surprisingly Useful The earliest combination lock was designed by the Arab engineer Al-Jazari around the year 1200. Opens fast on up/down/left/right directional movements, faster, easier, more secure than standard combination lock, can be opened 1 handed without looking for ease of use, can be reset to any number of movements in any sequence, maximum security with anti-shim feature. You can set your combination to any pattern of any length.
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