letter lock

Most listings use 3-digit or 4-digit codes. A 4-digit code is described as offering 10,000 possible combinations; 3-digit locks are described as providing several thousand combinations.

The listings reference several mechanisms depending on the model, including double-locking lever systems, pin-tumbler mechanisms, and warded lock designs.

Materials across the listings include zinc alloy, stainless steel (or stainless-steel covers), steel/steel alloy, and other metal constructions.

Descriptions list typical uses such as gym and school lockers, luggage and suitcases, backpacks, toolboxes, and smaller gates or fences for indoor or outdoor protection.

Package options shown across the listings include single packs and multi-packs such as 2-count, 3-count, and 4-count options.

Some listings note special features such as TSA approval for travel and push-button alpha/numeric keypad entry; a few also highlight over-the-door or push-button operation styles.

Descriptions say code setup and reset are straightforward: one model is described as 'incredibly easy to use' with clear instructions included, and another highlights a side-window design that makes setting the code effortless.