It has side half-cutting so we call WETQFN (wettable QFN ).
For the R1 , it is by sawing operation of half-cutting process so that the R1 can not be measured.
For dimple R2 & R3 ,due to they are natural result by the half-etching process ,so they also can not be measured.
The corner R in the drawing we still define R0.05 but actually our vendor can not control them.