This is a product code for a handle from Elesa & Ganter. The code describes both the external dimensions of the handle and the specific design options. The code is comprised of seven sections, each of which describes a specific dimension or feature of the handle.
The first section, “1-57-25-45-M10-28-55,” describes the handle’s length, width, profile, material, thread size, and thread style. The “1-57” indicates the handle length of 57 mm, the “25-45” indicates the handle width of 25 to 45 mm, the “M10” indicates the thread size of M10, and the “28-55” indicates the thread style as 28-55.