DIA 14X45X100-4F 55HRC
DIA 14 → Diameter of the tool is 14 mm.
45 → Likely the cutting length or flute length is 45 mm.
100 → Overall length of the tool is 100 mm.
4F → 4 Flutes, meaning the tool has 4 cutting edges.
55 HRC → Hardness of the tool material is 55 on the Rockwell Hardness Scale (HRC), which indicates a fairly hard cutting material, suitable for milling harder metals.
So, this is a solid carbide end mill (or similar milling cutter) with 14 mm diameter, 4 flutes, 45 mm cutting length, 100 mm overall length, and hardness 55 HRC.