14mm two-piece watch bands are designed for watches with standard lugs that require a 14mm band. They consist of two separate sections that attach to opposite sides of the watch case rather than passing underneath it.
Depending on the design, a two-piece band may use regular spring bars or quick release spring bars. The important requirement is that your watch has standard lugs and a 14mm lug width.
Before ordering, check your watch's lug width or manufacturer specifications and confirm that the required band width is 14mm.