Milling cutter model shows methodological # technology

How to examine milling cutter parameter?

How should model of wolfram steel milling cutter differentiate?

·D8 is 8mm on behalf of knife head diameter, r1 pours wine cup on behalf of edge for 1, r states flat bottom milling cutter does not have horn.

·20 state knife head grows to knife body blade for 20mm, 60L is 60mm endlong on behalf of knife body, 4F states cutting tool has 4 blade, 2F expresses to have 2 blade. Do 4 blade have with 2 blade why to differ? 4 blade suit face mill and side mill, and 2 blade suit mill keyway.