Most mechanical lock boxes in the market equipped with luggage-style rolling dials. Each dial has 10 slots for 10 characters.

On number combination lock boxes, it is resettable to any 4-number or 3-number combination. Each dial has all numbers from '0' to '9'. There are no limited on combination changes.

In contrast, not all 26 alphabets can fit on each dial. Only selected alphabets are available on each dial. Therefore, there will be a limited combination changes.

Selected NuSet lock boxes have revolutionary dials that can fit all 26 alphabets from 'A' to 'Z'.