All productnumbers are constructed in the same way. Here an example:
055 603 0055 0RL
055 - The first 3 "numbers" indicate the productgroupnumber (055 = knob)
603 - The next 3 "numbers" indicate the productnumber (603 = T-knob)
0055 - The following 4 "numbers" indicate the most important measurement in milimeters and sometimes an extra specification (0055 = 55mm width)
0RL - The last 3 "numbers" indicate the finishing/colour/material (0RL = the colour Rust Lacquer and in this case the material cast iron)
