This is a product code for a DVC leveler from Elesa & Ganter, a manufacturer of machine parts. The code is broken down as follows:
1-The product type, in this case DVC, which stands for Dynamic Vibration Control leveler.
20-The nominal size, or the size of the part in mm.
14-The thread size, in this case M14 (metric thread).
30-The body height, or the height of the part in mm.
M6-The thread size of the adjustable screws, in this case M6 (metric thread).
18-The number of adjustment points, in this case 18.
55-The load capacity, or the maximum recommended dynamic load in kg.